Overview: Hyperhidrosis is a medical condition characterized by abnormally heavy sweating beyond what is required to regulate body temperature. Affected individuals may perspire during rest or in cool environments. The phenomenon of sweating in hyperhidrosis is driven by overactive nerves and glands rather than external heat or exercise.
Common patterns and characteristics
Hyperhidrosis can be focal—limited to specific areas—or generalized. The most commonly affected sites are the palms, soles and underarms, though the face, scalp and groin may also be involved. Symptoms often include visible dripping or staining of clothing, frequent need to change socks or shirts, and interference with daily tasks (for example, holding a pen or using a touch screen when palms are wet).
Clinicians distinguish primary (idiopathic) hyperhidrosis, which usually begins in childhood or adolescence and tends to be localized, from secondary hyperhidrosis, which arises from another medical condition or medication and is often more generalized. The underlying organ involved in producing sweat is the sweat gland, which becomes hyperactive under the influence of the sympathetic nervous system.
Causes and diagnosis
Primary hyperhidrosis is commonly attributed to overactivity of the sympathetic nerves that stimulate sweat glands and may run in families. Secondary hyperhidrosis can be associated with endocrine disorders (such as hyperthyroidism), infections, neurologic conditions, metabolic problems, or certain drugs. Diagnosis is clinical, based on history and physical exam; tests such as starch–iodine or quantitative sudomotor testing are used in specialized centers.
Treatment options
Treatments range from conservative to invasive. Typical approaches include:
- Topical antiperspirants (aluminum chloride formulations)
- Iontophoresis for palms and soles
- Oral anticholinergic medications
- Botulinum toxin injections to block nerve signals to sweat glands
- Surgical procedures such as local gland excision or endoscopic thoracic sympathectomy in severe, refractory focal cases
Each option balances effectiveness with potential side effects—dry mouth and blurred vision from systemic drugs, muscle weakness or compensatory sweating after surgery, and localized pain or bruising after injections.
Impact, prevention and notable facts
Beyond physical discomfort, hyperhidrosis can have significant psychosocial effects, contributing to embarrassment, social withdrawal and occupational limitations. It is not contagious, and prevalence estimates vary across studies. Many people do not seek medical help because of embarrassment or lack of awareness that effective treatments exist. Lifestyle adjustments (breathable fabrics, frequent changes of clothing, managing triggers such as caffeine) can complement medical therapies.
Because causes and best interventions differ, individuals with new, sudden, or generalized excessive sweating should consult a health professional to exclude underlying conditions and to develop a tailored management plan.