Social determinants of health

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The social determinants of health are the economic and social conditions that influence individual and group differences in health status. [1] They are the health promoting factors found in one's living and working conditions (such as the distribution of income, wealth, influence, and power), rather than individual risk factors (such as behavioral risk factors or genetics) that influence the risk for a disease, or vulnerability to disease or injury. The distributions of social determinants are often shaped by public policies that reflect prevailing political ideologies of the area. [2] The World Health Organization says, "This unequal distribution of health-damaging experiences is not in any sense a 'natural' phenomenon but is the result of a toxic combination of poor social policies, unfair economic arrangements [where the already well-off and healthy become even richer and the poor who are already more likely to be ill become even poorer], and bad politics." [3]


Historical development of social determinants of health

Social Determinants of Health visualization Social determinants of health visualization.png
Social Determinants of Health visualization

Starting in the early 2000s, the World Health Organization facilitated the academic and political work on social determinants in a way that provided a deep understanding of health disparities in a global perspective.

In 2003, the World Health Organization (WHO) Europe suggested that the social determinants of health included: the social gradient, stress, early life, social exclusion, work, unemployment, social support, addiction, food, and transportation. [4]

In 2008, the WHO Commission on Social Determinants of Health published a report entitled "Closing the Gap in a Generation.", which aimed to understand, from a social justice perspective, how health inequity could be remedied, and what actions could combat factors that exacerbated injustices. [5] The work of the Commission was based on development goals, and thus, connected SDH (social determinants of health) discourse to economic growth and bridging gaps in the healthcare system. [5] This report identified two broad areas of social determinants of health that needed to be addressed. [5] The first area was daily living conditions, which included healthy physical environments, fair employment and decent work, social protection across the lifespan, and access to health care. The second major area was distribution of power, money, and resources, including equity in health programs, public financing of action on the social determinants, economic inequalities, resource depletion, healthy working conditions, gender equity, political empowerment, constitution of reserves [6] and a balance of power and prosperity of nations. [5]

The 2010 Affordable Care Act (ACA) established by the Obama administration in the United States, embodied the ideas put in place by the WHO by bridging the gap between community-based health and healthcare as a medical treatment, meaning that a larger consideration of social determinants of health was emerging in policy. [7] The ACA established community change through initiatives like providing Community Transformation Grants to community organizations, which opened up further debates and talks about increased integration of policies to create change on a larger scale. [8]

The 2011 World Conference on Social Determinants of Health, in which 125 delegations participated, created the Rio Political Declaration on Social Determinants of Health. [9] With a series of affirmations and announcements, the Declaration aimed to communicate that the social conditions in which an individual exists were key to understanding health disparities that individual may face, and it called for new policies across the world to fight health disparities, along with global collaborations. [10]

Commonly accepted social determinants

The United States Centers for Disease Control defines social determinants of health as "life-enhancing resources, such as food supply, housing, economic and social relationships, transportation, education, and health care, whose distribution across populations effectively determines length and quality of life". [11] These include access to care and resources such as food, insurance coverage, income, housing, and transportation. [11] Social determinants of health influence health-promoting behaviors, and health equity among the population is not possible without equitable distribution of social determinants among groups. [11]

In Canada, these social determinants of health have gained wide usage: Income and income distribution; Education; Unemployment and job security; Employment and working conditions; Early childhood development; Food insecurity [12] ; Housing; Social exclusion/inclusion; Social safety network; Health services; Aboriginal status; Gender; Race; Disability. [13]

Ongoing debates

Steven H. Woolf, MD of the Virginia Commonwealth University Center on Human Needs states, "The degree to which social conditions affect health is illustrated by the association between education and mortality rates". [14] Reports in 2005 revealed the mortality rate was 206.3 per 100,000 for adults aged 25 to 64 years with little education beyond high school, but was twice as great (477.6 per 100,000) for those with only a high school education and 3 times as great (650.4 per 100,000) for those less educated. Based on the data collected, the social conditions such as education, income, and race were dependent on one another, but these social conditions also apply to independent health influences. [14]

Marmot and Bell of the University College London found that in wealthy countries, income and mortality are correlated as a marker of relative position within society, and this relative position is related to social conditions that are important for health including good early childhood development, access to high quality education, rewarding work with some degree of autonomy, decent housing, and a clean and safe living environment. The social condition of autonomy, control, and empowerment turns are important influences on health and disease, and individuals who lack social participation and control over their lives are at a greater risk for heart disease and mental illness. [15]

Early childhood development can be promoted or disrupted as a result of the social and environmental factors effecting the mother, while the child is still in the womb. Janet Currie’s research finds that women in New York City receiving assistance from the Special Supplemental Nutrition Program for Women, Infants, and Children (WIC), in comparison to their previous or future childbirth, are 5.6% less likely to give birth to a child who is underweight, an indication that a child will have better short term, and long term physical, and cognitive development. [16]

Several other social determinants are related to health outcomes and public policy, and are easily understood by the public to impact health. [17] They tend to cluster together – for example, those living in poverty experience a number of negative health determinants. [18]

International health inequalities

Health gap in England and Wales, 2011 Census Health gap in England and Wales, 2011 Census.png
Health gap in England and Wales, 2011 Census

Even in the wealthiest countries, there are health inequalities between the rich and the poor. [19] Researchers Labonte and Schrecker from the Department of Epidemiology and Community Medicine at the University of Ottawa emphasize that globalization is key to understanding the social determinants of health, and as Bushra (2011) posits, the impacts of globalization are unequal. [20] Globalization has caused an uneven distribution of wealth and power both within and across national borders, and where and in what situation a person is born has an enormous impact on their health outcomes. The Organization for Economic Cooperation and Development found significant differences among developed nations in health status indicators such as life expectancy, infant mortality, incidence of disease, and death from injuries. [21] Migrants and their family members also experience significant negatives health impacts. [22]

These inequalities may exist in the context of the health care system, or in broader social approaches. According to the WHO's Commission on Social Determinants of Health, access to health care is essential for equitable health, and it argued that health care should be a common good rather than a market commodity. [3] However, there is substantial variation in health care systems and coverage from country to country. The Commission also calls for government action on such things as access to clean water and safe, equitable working conditions, and it notes that dangerous working conditions exist even in some wealthy countries. [3] [23] In the Rio Political Declaration on Social Determinants of Health, several key areas of action were identified to address inequalities, including promotion of participatory policy-making processes, strengthening global governance and collaboration, and encouraging developed countries to reach a target of 0.7% of gross national product (GNP) for official development assistance. [24]

Theoretical approaches

The UK Black and The Health Divide reports considered two primary mechanisms for understanding how social determinants influence health: cultural/behavioral and materialist/structuralist [25] The cultural/behavioral explanation is that individuals' behavioral choices (e.g., tobacco and alcohol use, diet, physical activity, etc.) were responsible for their development and deaths from a variety of diseases. However, both the Black and Health Divide reports found that behavioral choices are determined by one's material conditions of life, and these behavioral risk factors account for a relatively small proportion of variation in the incidence and death from various diseases.

The materialist/structuralist explanation emphasizes the people's material living conditions. These conditions include availability of resources to access the amenities of life, working conditions, and quality of available food and housing among others. Within this view, three frameworks have been developed to explain how social determinants influence health. [26] These frameworks are: (a) materialist; (b) neo-materialist; and (c) psychosocial comparison. The materialist view explains how living conditions – and the social determinants of health that constitute these living conditions – shape health. The neo-materialist explanation extends the materialist analysis by asking how these living conditions occur. The psychosocial comparison explanation considers whether people compare themselves to others and how these comparisons affect health and wellbeing.

A nation's wealth is a strong indicator of the health of its population. Within nations, however, individual socio-economic position is a powerful predictor of health. [27] Material conditions of life determine health by influencing the quality of individual development, family life and interaction, and community environments. Material conditions of life lead to differing likelihood of physical (infections, malnutrition, chronic disease, and injuries), developmental (delayed or impaired cognitive, personality, and social development, educational (learning disabilities, poor learning, early school leaving), and social (socialization, preparation for work, and family life) problems. [28] Material conditions of life also lead to differences in psychosocial stress. [29] When the fight-or-flight reaction is chronically elicited in response to constant threats to income, housing, and food availability, the immune system is weakened, insulin resistance is increased, and lipid and clotting disorders appear more frequently.

The materialist approach offers insight into the sources of health inequalities among individuals and nations. Adoption of health-threatening behaviours is also influenced by material deprivation and stress. [30] Environments influence whether individuals take up tobacco, use alcohol, consume poor diets, and have low levels of physical activity. Tobacco use, excessive alcohol consumption, and carbohydrate-dense diets are also used to cope with difficult circumstances. [31] [30] The materialist approach seeks to understand how these social determinants occur.

The neo-materialist approach is concerned with how nations, regions, and cities differ on how economic and other resources are distributed among the population. [32] This distribution of resources can vary widely from country to country. The neo-materialist view focuses on both the social determinants of health and the societal factors that determine the distribution of these social determinants, and especially emphasizes how resources are distributed among members of a society.

The social comparison approach holds that the social determinants of health play their role through citizens' interpretations of their standings in the social hierarchy. [33] There are two mechanisms by which this occurs. At the individual level, the perception and experience of one's status in unequal societies lead to stress and poor health. Feelings of shame, worthlessness, and envy can lead to harmful effects upon neuro-endocrine, autonomic and metabolic, and immune systems. [29] Comparisons to those of a higher social class can also lead to attempts to alleviate such feelings by overspending, taking on additional employment that threaten health, and adopting health-threatening coping behaviours such as overeating and using alcohol and tobacco. [33] At the communal level, widening and strengthening of hierarchy weakens social cohesion, which is a determinant of health. [34] The social comparison approach directs attention to the psychosocial effects of public policies that weaken the social determinants of health. However, these effects may be secondary to how societies distribute material resources and provide security to its citizens, which are described in the materialist and neo-materialist approaches.[ citation needed ]

Life-course perspective

Life-course approaches emphasize the accumulated effects of experience across the life span in understanding the maintenance of health and the onset of disease. The economic and social conditions – the social determinants of health – under which individuals live their lives have a cumulative effect upon the probability of developing any number of diseases, including heart disease and stroke. [35] [36] Studies into the childhood and adulthood antecedents of adult-onset diabetes show that adverse economic and social conditions across the life span predispose individuals to this disorder. [37] [38]

Hertzman outlines three health effects that have relevance for a life-course perspective. [39] Latent effects are biological or developmental early life experiences that influence health later in life. Low birth weight, for instance, is a reliable predictor of incidence of cardiovascular disease and adult-onset diabetes in later life. Nutritional deprivation during childhood has lasting health effects as well.

Pathway effects are experiences that set individuals onto trajectories that influence health, well-being, and competence over the life course. As one example, children who enter school with delayed vocabulary are set upon a path that leads to lower educational expectations, poor employment prospects, and greater likelihood of illness and disease across the lifespan. Deprivation associated with poor-quality neighbourhoods, schools, and housing sets children off on paths that are not conducive to health and well-being. [40] [ citation needed ]

Cumulative effects are the accumulation of advantage or disadvantage over time that manifests itself in poor health, in particular between women and men. [41] These involve the combination of latent and pathways effects. Adopting a life-course perspective directs attention to how social determinants of health operate at every level of development – early childhood, childhood, adolescence, and adulthood – to both immediately influence health and influence it in the future. [42] [43] [ citation needed ]

Chronic stress and health

Stress is hypothesized to be a major influence in the social determinants of health. There is a relationship between experience of chronic stress and negative health outcomes. [44] This relationship is explained through both direct and indirect effects of chronic stress on health outcomes.

The direct relationship between stress and health outcomes is the effect of stress on human physiology. The long term stress hormone, cortisol, is believed to be the key driver in this relationship. [45] Chronic stress has been found to be significantly associated with chronic low-grade inflammation, slower wound healing, increased susceptibility to infections, and poorer responses to vaccines. [44] Meta-analysis of healing studies has found that there is a robust relationship between elevated stress levels and slower healing for many different acute and chronic conditions [46] However, it is also important to note that certain factors, such as coping styles and social support, can mitigate the relationship between chronic stress and health outcomes. [47] [48]

Stress can also be seen to have an indirect effect on health status. One way this happens is due to the strain on the psychological resources of the stressed individual. Chronic stress is common in those of a low socio-economic status, who are having to balance worries about financial security, how they will feed their families, housing status, and many other concerns. [49] Therefore, individuals with these kinds of worries may lack the emotional resources to adopt positive health behaviours. Chronically stressed individuals may therefore be less likely to prioritize their health.

In addition to this, the way that an individual responds to stress can influence their health status. Often, individuals responding to chronic stress will develop potentially positive or negative coping behaviors. People who cope with stress through positive behaviors such as exercise or social connections may not be as affected by the relationship between stress and health, whereas those with a coping style more prone to over-consumption (i.e. emotional eating, drinking, smoking or drug use) are more likely to be see negative health effects of stress. [47]

The detrimental effects of stress on health outcomes are hypothesised to partly explain why countries that have high levels of income inequality have poorer health outcomes compared to more equal countries. [50] Wilkinson and Picket hypothesise in their book The Spirit Level that the stressors associated with low social status are amplified in societies where others are clearly far better off. [50]

Improving health conditions worldwide

Reducing the health gap requires that governments build systems that allow a healthy standard of living for every resident.


Three common interventions for improving social determinant outcomes as identified by the WHO are education, social security and urban development. However, evaluation of interventions has been difficult due to the nature of the interventions, their impact and the fact that the interventions strongly affect children's health outcomes. [51]

  1. Education: Many scientific studies have been conducted and strongly suggests that increased quantity and quality of education leads to benefits to both the individual and society (e.g. improved labor productivity). [52] Health and economic outcome improvements can be seen in health measures such as blood pressure, [53] [54] crime, [55] and market participation trends. [56] Examples of interventions include decreasing size of classes and providing additional resources to low-income school districts. However, there is currently insufficient evidence to support education as an social determinants intervention with a cost-benefit analysis. [51]
  2. Social Protection: Interventions such as “health-related cash transfers”, maternal education, and nutrition-based social protections have been shown to have a positive impact on health outcomes. [57] [58] However, the full economic costs and impacts generated of social security interventions are difficult to evaluate, especially as many social protections primarily affect children of recipients. [51]
  3. Urban Development: Urban development interventions include a wide variety of potential targets such as housing, transportation, and infrastructure improvements. The health benefits are considerable (especially for children), because housing improvements such as smoke alarm installation, concrete flooring, removal of lead paint, etc. can have a direct impact on health. [59] In addition, there is a fair amount of evidence to prove that external urban development interventions such as transportation improvements or improved walkability of neighborhoods (which is highly effective in developed countries) can have health benefits. [51] Affordable housing options (including public housing) can make large contributions to both social determinants of health, as well as the local economy. [60]

The Commission on Social Determinants of Health made recommendations in 2005 for action to promote health equity based on three principles: "improve the circumstances in which people are born, grow, live, work, and age; tackle the inequitable distribution of power, money, and resources, the structural drivers of conditions of daily life, globally, nationally, and locally; and measure the problem, evaluate action, and expand the knowledge base." [61] These recommendations would involve providing resources such as quality education, decent housing, access to affordable health care, access to healthy food, and safe places to exercise for everyone despite gaps in affluence. Expansion of knowledge of the social determinants of health, including among healthcare workers, can improve the quality and standard of care for people who are marginalized, poor or living in developing nations by preventing early death and disability while working to improve quality of life. [62]

Challenges of measuring value of interventions

Many economic studies have been conducted to measure the effectiveness and value of social determinant interventions but are unable to accurately reflect effects on public health due to the multi-faceted nature of the topic. While neither cost-effectiveness nor cost-utility analysis is able to be used on social determinant interventions, cost-benefit analysis is able to better capture the effects of an intervention on multiple sectors of the economy. For example, tobacco interventions have shown to decrease tobacco use, but also prolong lifespans, increasing lifetime healthcare costs and is therefore marked as a failed intervention by cost-effectiveness, but not cost-benefit. Another issue with research in this area is that most of the current scientific papers focus on rich, developed countries, and there is a lack of research in developing countries. [51]

Policy changes that affect children also present the challenge that it takes a significant amount of time to gather this type of data. In addition, policies to reduce child poverty are particularly important, as elevated stress hormones in children interfere with the development of brain circuitry and connections, causing long term chemical damage. [63] In most wealthy countries, the relative child poverty rate is 10 percent or less; in the United States, it is 21.9 percent. [64] The lowest poverty rates are more common in smaller well-developed and high-spending welfare states like Sweden and Finland, with about 5 or 6 percent. [64] Middle-level rates are found in major European countries where unemployment compensation is more generous and social policies provide more generous support to single mothers and working women (through paid family leave, for example), and where social assistance minimums are high. For instance, the Netherlands, Austria, Belgium and Germany have poverty rates that are in the 7 to 8 percent range. [65]

Addressing Social Determinants of Health Within Clinical Settings

Connecting patients with the necessary social services during their visits to hospitals or medical clinics is an important factor in preventing patients from experiencing decreased health outcomes as a result of social or environmental factors.

A clinical study done by researchers at the University of California San Francisco, indicated that connecting patients with the resources to utilize and contact social services during clinical visits, significantly decreased families social needs and significantly improved children's overall health. [66]

Public policy

The Rio Political Declaration on Social Determinants of Health embraces a transparent, participatory model of policy development that, among other things, addresses the social determinants of health leading to persistent health inequalities for indigenous peoples. [24] In 2017, citing the need for accountability for the pledges made by countries in the Rio Political Declaration on Social Determinants of Health, the World Health Organization and United Nations Children's Fund called for the monitoring of intersectoral interventions on the social determinants of health that improve health equity. [67]

The United States Department of Health and Human Services includes social determinants in its model of population health, and one of its missions is to strengthen policies which are backed by the best available evidence and knowledge in the field [68] Social determinants of health do not exist in a vacuum. Their quality and availability to the population are usually a result of public policy decisions made by governing authorities. For example, early life is shaped by availability of sufficient material resources that assure adequate educational opportunities, food and housing among others. Much of this has to do with the employment security and the quality of working conditions and wages. The availability of quality, regulated childcare is an especially important policy option in support of early life. [69] These are not issues that usually come under individual control but rather they are socially constructed conditions which require institutional responses. [70] A policy-oriented approach places such findings within a broader policy context. In this context, Health in All Policies has seen as a response to incorporate health and health equity into all public policies as means to foster synergy between sectors and ultimately promote health.

Yet it is not uncommon to see governmental and other authorities individualize these issues. Governments may view early life as being primarily about parental behaviours towards their children. They then focus upon promoting better parenting, assist in having parents read to their children, or urge schools to foster exercise among children rather than raising the amount of financial or housing resources available to families. Indeed, for every social determinant of health, an individualized manifestation of each is available. There is little evidence to suggest the efficacy of such approaches in improving the health status of those most vulnerable to illness in the absence of efforts to modify their adverse living conditions. [71]

A team of the Cochrane Collaboration conducted the first comprehensive systematic review of the health impact of unconditional cash transfers, as an increasingly common up-stream, structural social determinant of health. The review of 21 studies, including 16 randomized controlled trials, found that unconditional cash transfers may not improve health services use. However, they lead to a large, clinically meaningful reduction in the likelihood of being sick by an estimated 27%. Unconditional cash transfers may also improve food security and dietary diversity. Children in recipient families are more likely to attend school, and the cash transfers may increase money spent on health care. [72]

One of the recommendations by the Commission on the Social Determinants of Health is expanding knowledge – particularly to health care workers. [62]

Although not addressed by the WHO Commission on Social Determinants of Health, sexual orientation and gender identity are increasingly recognized as social determinants of health. [73]

See also

Notes and references

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  4. Wilkinson, Richard; Marmot, Michael, eds. (2003). The Social Determinants of Health: The Solid Facts (PDF) (2nd ed.). World Health Organization Europe. ISBN   978-92-890-1371-0.
  5. 1 2 3 4 Commission on Social Determinants of Health (2008). Closing the Gap in a Generation: Health Equity Through Action on the Social Determinants of Health (PDF). World Health Organization. ISBN   978-92-4-156370-3 . Retrieved 2013-03-27. Pg 2
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Health is a state of physical, mental and social well-being in which disease and infirmity are absent.

Preventive healthcare Prevent and minimize the occurrence of diseases

Preventive healthcare, or prophylaxis, consists of measures taken for disease prevention. Disease and disability are affected by environmental factors, genetic predisposition, disease agents, and lifestyle choices and are dynamic processes which begin before individuals realize they are affected. Disease prevention relies on anticipatory actions that can be categorized as primal, primary, secondary, and tertiary prevention.

Community health is a branch of public health which focuses on people and their role as determinants of their own and other people's health in contrast to environmental health, which focuses on the physical environment and its impact on people's health.

Health equity arises from access to the social determinants of health, specifically from wealth, power and prestige. Individuals who have consistently been deprived of these three determinants are significantly disadvantaged from health inequities, and face worse health outcomes than those who are able to access certain resources. It is not equity to simply provide every individual with the same resources; that would be equality. In order to achieve health equity, resources must be allocated based on an individual need-based principle.

The Whitehall Studies investigated social determinants of health, specifically the cardiovascular disease prevalence and mortality rates among British civil servants. The initial prospective cohort study, the Whitehall I Study, examined over 17,500 male civil servants between the ages of 20 and 64, and was conducted over a period of ten years, beginning in 1967. A second cohort study, the Whitehall II Study, was conducted from 1985 to 1988 and examined the health of 10,308 civil servants aged 35 to 55, of whom two thirds were men and one third women. A long-term follow-up of study subjects from the first two phases is ongoing.

Population health the study of health outcomes for groups of individuals

Population health has been defined as "the health outcomes of a group of individuals, including the distribution of such outcomes within the group". According to Akarowhe (2018), the working definition of population health is expressed thus; population health is an art, process, science and a product of enhancing the health condition of a specific number of people within a given geographical area - population health as an art, simply means that it is geared towards equal health care delivery to an anticipated group of people in a particular geographical location; as a science, it implies that it adopt scientific approach of preventive, therapeutic, and diagnostic service in proffering medical treatment to the health problem of people; as a product, it means that population health is directed toward overall health performance of people through health satisfaction within the said geographical area; and as a process it entails effective and efficient running of a health management/population health management system to cater for the health needs of the people. It is an approach to health that aims to improve the health of an entire human population. This concept does not refer to animal or plant populations. It has been described as consisting of three components. These are "health outcomes, patterns of health determinants, and policies and interventions". A priority considered important in achieving the aim of Population Health is to reduce health inequities or disparities among different population groups due to, among other factors, the social determinants of health, SDOH. The SDOH include all the factors that the different populations are born into, grow up and function with throughout their lifetimes which potentially have a measurable impact on the health of human populations. The Population Health concept represents a change in the focus from the individual-level, characteristic of most mainstream medicine. It also seeks to complement the classic efforts of public health agencies by addressing a broader range of factors shown to impact the health of different populations. The World Health Organization's Commission on Social Determinants of Health, reported in 2008, that the SDOH factors were responsible for the bulk of diseases and injuries and these were the major causes of health inequities in all countries. In the US, SDOH were estimated to account for 70% of avoidable mortality.

Screening (medicine) brief evaluation to detect unnoticed health problems

Screening, in medicine, is a strategy used to look for as-yet-unrecognised conditions or risk markers. This testing can be applied to individuals or to a whole population. The people tested may not exhibit any signs or symptoms of a disease, or they might exhibit only one or two symptoms, which by themselves do not indicate a definitive diagnosis.

Michael Marmot Professor of Epidemiology and Public Health

Sir Michael Gideon Marmot, FBA, FMedSci, FRCP is Professor of Epidemiology and Public Health at University College London. He is currently the Director of The UCL Institute of Health Equity.

A chronic condition is a human health condition or disease that is persistent or otherwise long-lasting in its effects or a disease that comes with time. The term chronic is often applied when the course of the disease lasts for more than three months. Common chronic diseases include arthritis, asthma, cancer, chronic obstructive pulmonary disease, diabetes and some viral diseases such as hepatitis C and acquired immunodeficiency syndrome. An illness which is lifelong because it ends in death is a terminal illness. It is possible and not unexpected for an illness to change in definition from terminal to chronic. Diabetes and HIV for example were once terminal yet are now considered chronic due to the availability of insulin and daily drug treatment for individuals with HIV which allow these individuals to live while managing symptoms.

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Race and health refers to how being identified with a specific race influences health. Race is a complex concept that changes across time and space and that depends on both self-identification and social recognition. In the study of race and health, scientists organize people in racial categories depending on different factors such as: phenotype, ancestry, social identity, genetic makeup and lived experience. “Race” and ethnicity often remain undifferentiated in health research.

While epidemiology is "the study of the distribution and determinants of states of health in populations", social epidemiology is "that branch of epidemiology concerned with the way that social structures, institutions, and relationships influence health." This research includes "both specific features of, and pathways by which, societal conditions affect health".

Social epidemiology focuses on the patterns in morbidity and mortality rates that emerge as a result of social characteristics. While an individual's lifestyle choices or family history may place him or her at an increased risk for developing certain illnesses, there are social inequalities in health that cannot be explained by individual factors. Variations in health outcomes in the United States are attributed to several social characteristics, such as gender, race, socioeconomic status, the environment, and educational attainment. Inequalities in any or all of these social categories can contribute to health disparities, with some groups placed at an increased risk for acquiring chronic diseases than others.

Occupational stress Tensions related to work

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The social determinants of health in poverty describe the factors that affect impoverished populations' health and health inequality. Inequalities in health stem from the conditions of people's lives, including living conditions, work environment, age, and other social factors, and how these affect people's ability to respond to illness. These conditions are also shaped by political, social, and economic structures. The majority of people around the globe do not meet their potential best health because of a "toxic combination of bad policies, economics, and politics". Daily living conditions work together with these structural drivers to result in the social determinants of health.

Glasgow effect low life expectancy and poor health of residents of Scotland, and Glasgow in particular, compared to the rest of Europe

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In a study in Western societies, homeless people have a higher prevalence of mental illness when compared to the general population. They also are more likely to suffer from alcoholism and drug dependency. It is estimated that 20–25% of homeless people, compared with 6% of the non-homeless, have severe mental illness. Others estimate that up to one-third of the homeless suffer from mental illness. In January 2015, the most extensive survey ever undertaken found 564,708 people were homeless on a given night in the United States. Depending on the age group in question, and how homelessness is defined, the consensus estimate as of 2014 was that, at minimum, 25% of the American homeless—140,000 individuals—were seriously mentally ill at any given point in time. 45% percent of the homeless—250,000 individuals—had any mental illness. More would be labeled homeless if these were annual counts rather than point-in-time counts.

Social determinants of health in Mexico

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Population health, a field which focuses on the improvement of the health outcomes for a group of individuals, has been described as consisting of three components: "health outcomes, patterns of health determinants, and policies and interventions". Policies and Interventions define the methods in which health outcomes and patterns of health determinants are implemented. Policies which are helpful "improve the conditions under which people live". Interventions encourage healthy behaviors for individuals or populations through "program elements or strategies designed to produce behavior changes or improve health status".

Mental health inequality refers to the differences in the quality, access, and health care different communities and populations receive for mental health services. Globally, the World Health Organization estimates that 350 million people are affected with depressive disorders. Mental health can be defined as an individual's well-being and/or the absence of clinically defined mental illness. Inequalities that can occur in mental healthcare may include mental health status, access to and quality of care, and mental health outcomes, which may differ across populations of different race, ethnicity, sexual orientation, sex, gender, socioeconomic statuses, education level, and geographic location. Social determinants of health that can influence an individual's susceptibility to developing mental disorders and illnesses include, but are not limited to, economic status, education level, demographics, geographic location and genetics.