Burning mouth syndrome

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Burning mouth syndrome
Other namesGlossodynia, [1] orodynia, [2] oral dysaesthesia, [3] glossopyrosis, [3] stomatodynia, [1] burning tongue, [4] stomatopyrosis, [3] sore tongue, [3] burning tongue syndrome, [5] burning mouth, [3] or sore mouth [6]
Specialty Oral medicine

Burning mouth syndrome (BMS) is a burning, tingling or scalding sensation in the mouth, lasting for at least four to six months, with no underlying known dental or medical cause. [3] [7] No related signs of disease are found in the mouth. [3] People with burning mouth syndrome may also have a subjective xerostomia (dry mouth sensation where no cause can be found such as reduced salivary flow), paraesthesia (altered sensation such as tingling in the mouth), or an altered sense of taste or smell. [3]

Contents

A burning sensation in the mouth can be a symptom of another disease when local or systemic factors are found to be implicated; this is not considered to be burning mouth syndrome, [3] which is a syndrome of medically unexplained symptoms. [3] The International Association for the Study of Pain defines burning mouth syndrome as "a distinctive nosological entity characterized by unremitting oral burning or similar pain in the absence of detectable mucosal changes" [1] and "burning pain in the tongue or other oral mucous membranes", [8] and the International Headache Society defines it as "an intra-oral burning sensation for which no medical or dental cause can be found". [6] To ensure the correct diagnosis of burning mouth syndrome, Research Diagnostic Criteria (RDC/BMS) have been developed. [9]

Insufficient evidence leaves it unclear if effective treatments exist. [3]

Signs and symptoms

By definition, BMS has no signs. Sometimes affected persons will attribute the symptoms to sores in the mouth, but these are in fact normal anatomic structures (e.g. lingual papillae, varices). [10] Symptoms of BMS are variable, but the typical clinical picture is given below, considered according to the Socrates pain assessment method (see table). If clinical signs are visible, then another explanation for the burning sensation may be present. Erythema (redness) and edema (swelling) of papillae on the tip of the tongue may be a sign that the tongue is being habitually pressed against the teeth. The number and size of filiform papillae may be reduced. If the tongue is very red and smooth, then there is likely a local or systemic cause (e.g. erythematous candidiasis, anemia). [5]

ParameterUsual findings in burning mouth syndrome. [1] [3] [8] [10] [11] [12]
SiteUsually bilaterally located on the tongue or less commonly the palate, lips or lower alveolar mucosa
OnsetPain is chronic, and rarely spontaneously remits
CharacterBurning, scalded or tingling. Sometimes the sensation is described as 'discomfort', 'tender', 'raw' and 'annoying' rather than pain or burning.
Radiation
AssociationsPossibly subjective xerostomia, dysgeusia (altered taste), thirst, headaches, chronic back pain, irritable bowel syndrome, dysmenorrhea, globus pharyngis, anxiety, decreased appetite, depression and personality disorders
Time courseType 2 (most common) pain upon waking and throughout day, less commonly other patterns.
Exacerbating/Relieving factorsPossible exacerbating factors (make the pain worse) include tension, fatigue, speaking, and hot, acidic or spicy foods. Possible relieving factors include sleeping, cold, distraction, and alcohol. The pain is often relieved by eating and drinking (unlike pain caused by organic lesions or neuralgia) or when the person's attention is occupied. Temporary relief while eating is described as "almost pathognomonic" by the IASP. Pain is not often relieved by systemic analgesics, but can sometimes be relieved by topical anesthetics.
SeverityModerate to severe, rated 5-8 out of 10, similar in intensity to toothache
Effect on sleepMay not disturb sleep, or may change sleep patterns, e.g. insomnia.
Previous treatmentOften multiple consultations and unsuccessful attempts at dental and/or medical treatment

Causes

Theories

In about 50% of cases of burning mouth sensation no identifiable cause is apparent; [1] these cases are termed (primary) BMS. [11] Several theories of what causes BMS have been proposed, and these are supported by varying degrees of evidence, but none is proven. [5] [11] As most people with BMS are postmenopausal women, one theory of the cause of BMS is of estrogen or progesterone deficit, but a strong statistical correlation has not been demonstrated. [5] Another theory is that BMS is related to autoimmunity, as abnormal antinuclear antibody and rheumatoid factor can be found in the serum of more than 50% of persons with BMS, but these levels may also be seen in elderly people who do not have any of the symptoms of this condition. [5] Whilst salivary flow rates are normal and there are no clinical signs of a dry mouth to explain a complaint of dry mouth, levels of salivary proteins and phosphate may be elevated and salivary pH or buffering capacity may be reduced. [5]

Depression and anxiety are strongly associated with BMS. [5] [13] [14] It is not known if depression is a cause or result of BMS, as depression may develop in any setting of constant unrelieved irritation, pain, and sleep disturbance. [5] [12] [15] It is estimated that about 20% of BMS cases involve psychogenic factors, [14] and some consider BMS a psychosomatic illness, [5] [13] caused by cancerophobia, [13] [14] concern about sexually transmitted infections, [14] or hypochondriasis. [13]

Chronic low-grade trauma due to parafunctional habits (e.g. rubbing the tongue against the teeth or pressing it against the palate), may be involved. [12] BMS is more common in persons with Parkinson's disease, so it has been suggested that it is a disorder of reduced pain threshold and increased sensitivity. Often people with BMS have unusually raised taste sensitivity, termed hypergeusia ("super tasters"). [1] Dysgeusia (usually a bitter or metallic taste) is present in about 60% of people with BMS, a factor which led to the concept of a defect in sensory peripheral neural mechanisms. [12] Changes in the oral environment, such as changes in the composition of saliva, may induce neuropathy or interruption of nerve transduction. [1] [11] The onset of BMS is often spontaneous, although it may be gradual. There is sometimes a correlation with a major life event or stressful period in life. [10] In women, the onset of BMS is most likely three to twelve years following menopause. [5]

Other causes of an oral burning sensation

Substances capable of causing an oral burning sensation. [1]
Foods and additives

Metals

Plastics

Several local and systemic factors can give a burning sensation in the mouth without any clinical signs, and therefore may be misdiagnosed as BMS. Some sources state that where there is an identifiable cause for a burning sensation, this can be termed "secondary BMS" to distinguish it from primary BMS. [16] [17] However, the accepted definitions of BMS hold that there are no identifiable causes for BMS, [1] [3] [6] and where there are identifiable causes, the term BMS should not be used. [3]

Some causes of a burning mouth sensation may be accompanied by clinical signs in the mouth or elsewhere on the body. For example, burning mouth pain may be a symptom of allergic contact stomatitis. This is a contact sensitivity (type IV hypersensitivity reaction) in the oral tissues to common substances such as sodium lauryl sulfate, cinnamaldehyde or dental materials. [4] However, allergic contact stomatitis is accompanied by visible lesions and gives positive response with patch testing. Acute (short term) exposure to the allergen (the substance triggering the allergic response) causes non-specific inflammation and possibly mucosal ulceration. Chronic (long term) exposure to the allergen may appear as chronic inflammatory, lichenoid (lesions resembling oral lichen planus), or plasma cell gingivitis, which may be accompanied by glossitis and cheilitis. [12] Apart from BMS itself, a full list of causes of an oral burning sensation is given below:

Diagnosis

BMS is a diagnosis of exclusion, i.e. all other explanations for the symptoms are ruled out before the diagnosis is made. [1] [16] There are no clinically useful investigations that would help to support a diagnosis of BMS [3] (by definition all tests would have normal results), [1] but blood tests and / or urinalysis may be useful to rule out anemia, deficiency states, hypothyroidism and diabetes. Investigation of a dry mouth symptom may involve sialometry, which objectively determines if there is any reduction of the salivary flow rate (hyposalivation). Oral candidiasis can be tested for with use of a swabs, smears, an oral rinse or saliva samples. [11] It has been suggested that allergy testing (e.g., patch test) is inappropriate in the absence of a clear history and clinical signs in people with a burning sensation in the mouth. [11] The diagnosis of a people with a burning symptom may also involve psychologic screening e.g. depression questionnaires. [1]

The second edition of the International Classification of Headache Disorders lists diagnostic criteria for "Glossodynia and Sore Mouth":

A. Pain in the mouth present daily and persisting for most of the day,
B. Oral mucosa is of normal appearance,
C. Local and systemic diseases have been excluded. [21]

Classification

A burning sensation in the mouth may be primary (i.e. burning mouth syndrome) or secondary to systemic or local factors. [1] Other sources refer to a "secondary BMS" with a similar definition, i.e. a burning sensation which is caused by local or systemic factors, [16] or "where oral burning is explained by a clinical abnormality". [17] However this contradicts the accepted definition of BMS which specifies that no cause can be identified. "Secondary BMS" could therefore be considered a misnomer. BMS is an example of dysesthesia, or a distortion of sensation. [5]

Some consider BMS to be a variant of atypical facial pain. [22] More recently, BMS has been described as one of the 4 recognizable symptom complexes of chronic facial pain, along with atypical facial pain, temporomandibular joint dysfunction and atypical odontalgia. [23] BMS has been subdivided into three general types, with type two being the most common and type three being the least common. [1] Types one and two have unremitting symptoms, whereas type three may show remitting symptoms. [1]

Sometimes those terms specific to the tongue (e.g. glossodynia) are reserved for when the burning sensation is located only on the tongue. [21]

Treatment

If a cause can be identified for a burning sensation in the mouth, then treatment of this underlying factor is recommended. If symptom persist despite treatment a diagnosis of BMS is confirmed. [11] BMS has been traditionally treated by reassurance and with antidepressants, anxiolytics or anticonvulsants. A 2016 Cochrane review of treatment for burning mouth syndrome concluded that strong evidence of an effective treatment was not available, [3] however, a systematic review in 2018 found that the use of antidepressants and alpha-lipoic acids gave promising results. [24] [25]

Other treatments which have been used include atypical antipsychotics, histamine receptor antagonists, and dopamine agonists. [26] Supplementation with vitamin complexes and cognitive behavioral therapy may be helpful in the management of burning mouth syndrome. [27]

Prognosis

BMS is benign (importantly, it is not a symptom of oral cancer), but as a cause of chronic pain which is poorly controlled, it can detriment quality of life, and may become a fixation which cannot be ignored, thus interfering with work and other daily activities. [10] [28] Two thirds of people with BMS have a spontaneous partial recovery six to seven years after the initial onset, but in others the condition is permanent. [5] [15] Recovery is often preceded by a change in the character of the symptom from constant to intermittent. [15] No clinical factors predicting recovery have been noted. [15]

If there is an identifiable cause for the burning sensation, then psychologic dysfunctions such as anxiety and depression often disappear if the symptom is successfully treated. [5]

Epidemiology

BMS is fairly uncommon worldwide, affecting up to five individuals per 100,000 general population. [3] People with BMS are more likely to be middle aged or elderly, and females are three to seven times more likely to have BMS than males. [1] [29] Some report a female to male ratio of as much as 33 to 1. [6] BMS is reported in about 10-40% of women seeking medical treatment for menopausal symptoms, and BMS occurs in about 14% of postmenopausal women. [5] [15] [ contradictory ] Males and younger individuals of both sexes are sometimes affected. [10]

Asian and Native American people have considerably higher risk of BMS. [5]

Notable cases

Sheila Chandra, a singer of Indian heritage, retired due to this condition. [30]

Related Research Articles

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<span class="mw-page-title-main">Sjögren syndrome</span> Autoimmune disease affecting the bodys moisture-producing glands

Sjögren syndrome or Sjögren's syndrome is a long-term autoimmune disease that affects the body's moisture-producing glands, and often seriously affects other organ systems, such as the lungs, kidneys, and nervous system.

Dysgeusia, also known as parageusia, is a distortion of the sense of taste. Dysgeusia is also often associated with ageusia, which is the complete lack of taste, and hypogeusia, which is a decrease in taste sensitivity. An alteration in taste or smell may be a secondary process in various disease states, or it may be the primary symptom. The distortion in the sense of taste is the only symptom, and diagnosis is usually complicated since the sense of taste is tied together with other sensory systems. Common causes of dysgeusia include chemotherapy, asthma treatment with albuterol, and zinc deficiency. Liver disease, hypothyroidism, and rarely, certain types of seizures can also lead to dysgeusia. Different drugs can also be responsible for altering taste and resulting in dysgeusia. Due to the variety of causes of dysgeusia, there are many possible treatments that are effective in alleviating or terminating the symptoms. These include artificial saliva, pilocarpine, zinc supplementation, alterations in drug therapy, and alpha lipoic acid.

<span class="mw-page-title-main">Mouth ulcer</span> Sore on the mucous membrane of the oral cavity

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<span class="mw-page-title-main">Uremia</span> Type of kidney disease, urea in the blood

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<span class="mw-page-title-main">Toothache</span> Medical condition of the teeth

Toothache, also known as dental pain or tooth pain, is pain in the teeth or their supporting structures, caused by dental diseases or pain referred to the teeth by non-dental diseases. When severe it may impact sleep, eating, and other daily activities.

<span class="mw-page-title-main">Xerostomia</span> Medical condition

Xerostomia, also known as dry mouth, is dryness in the mouth, which may be associated with a change in the composition of saliva, or reduced salivary flow, or have no identifiable cause.

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<span class="mw-page-title-main">Glossitis</span> Medical condition

Glossitis can mean soreness of the tongue, or more usually inflammation with depapillation of the dorsal surface of the tongue, leaving a smooth and erythematous (reddened) surface,. In a wider sense, glossitis can mean inflammation of the tongue generally. Glossitis is often caused by nutritional deficiencies and may be painless or cause discomfort. Glossitis usually responds well to treatment if the cause is identified and corrected. Tongue soreness caused by glossitis is differentiated from burning mouth syndrome, where there is no identifiable change in the appearance of the tongue, and there are no identifiable causes.

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<span class="mw-page-title-main">Sialadenitis</span> Medical condition

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<span class="mw-page-title-main">Sialolithiasis</span> Medical condition

Sialolithiasis is a crystallopathy where a calcified mass or sialolith forms within a salivary gland, usually in the duct of the submandibular gland. Less commonly the parotid gland or rarely the sublingual gland or a minor salivary gland may develop salivary stones.

Oral and maxillofacial pathology refers to the diseases of the mouth, jaws and related structures such as salivary glands, temporomandibular joints, facial muscles and perioral skin. The mouth is an important organ with many different functions. It is also prone to a variety of medical and dental disorders.

<span class="mw-page-title-main">Tongue disease</span> Medical condition

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Atypical facial pain (AFP) is a type of chronic facial pain which does not fulfill any other diagnosis. There is no consensus as to a globally accepted definition, and there is even controversy as to whether the term should be continued to be used. Both the International Headache Society (IHS) and the International Association for the Study of Pain (IASP) have adopted the term persistent idiopathic facial pain (PIFP) to replace AFP. In the 2nd Edition of the International Classification of Headache Disorders (ICHD-2), PIFP is defined as "persistent facial pain that does not have the characteristics of the cranial neuralgias ... and is not attributed to another disorder." However, the term AFP continues to be used by the World Health Organization's 10th revision of the International Statistical Classification of Diseases and Related Health Problems and remains in general use by clinicians to refer to chronic facial pain that does not meet any diagnostic criteria and does not respond to most treatments.

<span class="mw-page-title-main">Orofacial pain</span> Medical condition

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Oral manifestations of systematic disease are signs and symptoms of disease occurring elsewhere in the body detected in the oral cavity and oral secretions. High blood sugar can be detected by sampling saliva. Saliva sampling may be a non-invasive way to detect changes in the gut microbiome and changes in systemic disease. Another example is tertiary syphilis, where changes to teeth can occur. Syphilis infection can be associated with longitudinal furrows of the tongue.

References

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  27. ↑ Zakrzewska, Jm; Glenny, Am; Forssell, H (23 October 2000). "Interventions for the treatment of burning mouth syndrome". Cochrane Database of Systematic Reviews (3): CD002779. doi:10.1002/14651858.CD002779. PMID   11687027.
  28. ↑ Pereira, Juliana Vianna; Normando, Ana Gabriela Costa; Rodrigues-Fernandes, Carla Isabelly; Rivera, César; Santos-Silva, Alan Roger; Lopes, Márcio Ajudarte (February 2021). "The impact on quality of life in patients with burning mouth syndrome: A systematic review and meta-analysis". Oral Surgery, Oral Medicine, Oral Pathology and Oral Radiology. 131 (2): 186–194. doi:10.1016/j.oooo.2020.11.019. ISSN   2212-4411. PMID   33353825. S2CID   229689619.
  29. ↑ Greenberg MS; Glick M; Ship JA. Burket's Oral Medicine. 11th edition. 2012
  30. ↑ "Sheila Chandra United Kingdom". Real World Records. Retrieved 1 August 2013.
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