Anhidrosis – Causes, Symptoms and Treatment
Anhidrosis is a condition in which the sweat glands produce little or no sweat, impairing the body's ability to regulate temperature and increasing the risk of overheating.
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Anhidrosis is a condition in which the sweat glands produce little or no sweat, impairing the body's ability to regulate temperature and increasing the risk of overheating.
What is Anhidrosis?
Anhidrosis is a medical condition characterized by the inability to sweat normally. Since sweating is the body's primary cooling mechanism, anhidrosis can lead to dangerous overheating (hyperthermia) and, in severe cases, life-threatening heat stroke. The condition may affect the entire body or be limited to specific regions.
Causes
Anhidrosis can result from a variety of underlying causes:
- Nerve damage: Conditions such as diabetes mellitus, amyloidosis, or Fabry disease can damage the nerves that control sweat glands.
- Skin conditions: Scarring, psoriasis, or ichthyosis may permanently destroy sweat gland tissue.
- Genetic disorders: Inherited conditions such as ectodermal dysplasia cause malformation of sweat glands from birth.
- Medications: Anticholinergic drugs and certain other medications can suppress sweat production.
- Autoimmune diseases: Conditions like Sjogren syndrome can impair exocrine gland function, including sweat glands.
- Spinal cord injuries: Damage to the spinal cord can interrupt nerve signals to the sweat glands.
Symptoms
Symptoms of anhidrosis vary depending on the extent of the condition:
- Absent or severely reduced sweating even during heat exposure or physical exertion
- Flushing, dizziness, and a sensation of overheating
- Muscle cramps related to heat retention
- Nausea and general malaise
- In severe cases: heat stroke, which is a medical emergency
In partial anhidrosis, unaffected areas of the body may exhibit compensatory hyperhidrosis (excessive sweating).
Diagnosis
Diagnosis is confirmed through several tests and examinations:
- Quantitative sudomotor axon reflex test (QSART): Measures sweat output in response to heat or chemical stimulation.
- Starch-iodine test: Visually identifies areas of absent or reduced sweating on the skin.
- Skin biopsy: Microscopic evaluation of sweat gland structure and density.
- Neurological examination: To identify underlying nerve disorders.
- Blood tests: To detect conditions such as diabetes or autoimmune diseases contributing to anhidrosis.
Treatment
Treatment focuses on addressing the underlying cause and preventing heat-related complications:
- Managing the underlying condition (e.g., blood sugar control in diabetes)
- Discontinuing or switching medications that inhibit sweat production
- Active body cooling using cool environments, damp cloths, or air conditioning
- Avoiding heat exposure and strenuous physical activity in warm conditions
- Regular medical monitoring, especially in cases of widespread anhidrosis
A complete cure is often not possible, but consistent heat avoidance and supportive measures can effectively prevent serious complications.
References
- Low P.A. - Evaluation of sudomotor function. Clinical Neurophysiology, 2004; 115(7): 1506-1513. PubMed PMID: 15203054.
- Cheshire W.P., Freeman R. - Disorders of sweating. Seminars in Neurology, 2003; 23(4): 399-406. PubMed PMID: 15088263.
- World Health Organization (WHO) - International Classification of Diseases (ICD-11), Anhidrosis (Entry 5C80). https://icd.who.int
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Related search terms: Anhidrosis + Anhydrosis + Anhidroses