Hyperhidrosis overview
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Editor-In-Chief: C. Michael Gibson, M.S., M.D. [2]
Overview
Primary hyperhidrosis is the condition characterized by abnormally increased perspiration, in excess of that required for regulation of body temperature. There is controversy regarding the definition of hyperhidrosis, because any sweat that drips off of the body is in excess of that required for thermoregulation. Almost all people will drip sweat off of the body during heavy exercise.
Classification
- Primary hyperhidrosis must be distinguished from secondary hyperhidrosis, which can start at any point in life. For some, it can seem to come on unexpectedly. The latter form may be due to a disorder of the thyroid or pituitary gland, diabetes mellitus, tumors, gout, menopause, certain drugs, or mercury poisoning[1]. Such secondary forms may have more serious consequences than just hyperhidrosis, making medical consultation advisable.
- Hyperhidrosis can also be classified as focal or generalised.
- Focal hyperhidrosis is most commonly seen during emotional outbursts like sweating of palms, axillae, face etc. Generalised hyperhidrosis affects the entire body and can be triggered by emotion or exertion/heat for thermoregulation.
Pathophysiology
- Sweat is a hypotonic solution produced by eccrine glands and apocrine glands which are distributed all over the body.
- Most of the body's sweat is produced by the eccrine glands. Eccrine glands have the highest concentration in the axillae. These glands play an important role in thermoregulation. [2]
- Apocrine sweat glands are seen in the axillae and urogenital region. [3]
- Sweating is caused by two broad impulses- thermoregulation and emotion. The thermoregulatory centre of sweating is located in the hypothalamus and is triggered by increased body temperature (eg., fever) and the emotion centre of sweating is located in the limbic system and is triggered by extreme emotional states like anxiety, fear etc.
- It is not known what causes primary hyperhidrosis. One theory is that hyperhidrosis results from an overactive sympathetic nervous system, but this hyperactivity may in turn be caused by abnormal brain function.
- Some patients afflicted with the condition experience a certain degree of reduction in their quality of life, depending on how severe their condition is. Sufferers feel at a loss of control because perspiration takes place independent of temperature and emotional state. However, anxiety can exacerbate the situation for many sufferers. A common complaint of patients is that they get nervous because they sweat, then sweat more because they are nervous. Other factors can play a role; certain foods & drinks, nicotine, caffeine, and smells can trigger a response (see also diaphoresis).
Causes
The cause of primary hyperhidrosis is unknown, although some surgeons claim it is caused by sympathetic over-activity.Nervousness or excitement can exacerbate the situation for many sufferers. Other factors can play a role; certain foods and drinks,nicotine, caffeine, and smells can trigger a response. A common complaint of patients is they get nervous because they sweat, then sweat more because they are nervous.
Diagnosis
History and Symptoms
Hyperhidrosis can either be generalized or localized to specific parts of the body. Hands, feet, axillae, and the groin area are among the most active regions of perspiration due to the relatively high concentration of sweat glands; however, any part of the body may be affected. Primary hyperhidrosis is found to start during adolescence or even before, and interestingly, seems to be inherited as an autosomal dominant genetic trait.
Treatment
Medical Therapy
Hyperhidrosis can usually be very effectively controlled, but there is no known permanent cure because little is known about the cause behind excessive sweating.
References
- ↑ Schlereth T, Dieterich M, Birklein F (2009). "Hyperhidrosis--causes and treatment of enhanced sweating". Dtsch Arztebl Int. 106 (3): 32–7. doi:10.3238/arztebl.2009.0032. PMC 2695293. PMID 19564960.
- ↑ Sato K, Kang WH, Saga K, Sato KT (1989). "Biology of sweat glands and their disorders. I. Normal sweat gland function". J Am Acad Dermatol. 20 (4): 537–63. doi:10.1016/s0190-9622(89)70063-3. PMID 2654204.
- ↑ Sato K, Leidal R, Sato F (1987). "Morphology and development of an apoeccrine sweat gland in human axillae". Am J Physiol. 252 (1 Pt 2): R166–80. doi:10.1152/ajpregu.1987.252.1.R166. PMID 3812728.