Excessive Sweating (Hyperhidrosis): Causes, Contributing Factors, and When to See a Doctor

Sweating is essential for thermoregulation. Hyperhidrosis—excessive sweating beyond physiological need—affects ~3% of the population. It can be primary (idiopathic, focal) or secondary (generalized, due to underlying cause).

Primary Hyperhidrosis (Focal, Usually Symmetric)

• Onset: Childhood/adolescence.
• Sites: Palms, soles, axillae, face.
• Triggers: Heat, emotion, spicy food—no underlying disease.
• Genetic: Autosomal dominant with variable penetrance.

Secondary Hyperhidrosis (Generalized) – Medical Causes

• Endocrine: Hyperthyroidism, diabetes (hypoglycemia), menopause, pregnancy, carcinoid, pheochromocytoma.
• Neurologic: Stroke, spinal cord injury, autonomic neuropathy, Parkinson’s.
• Infections: TB, HIV, endocarditis, malaria (night sweats).
• Malignancy: Lymphoma, leukemia (night sweats).
• Medications: Antidepressants (SSRIs, SNRIs), opioids, antipsychotics, cholinesterase inhibitors, propranolol, pilocarpine.
• Substances: Alcohol withdrawal, caffeine, nicotine.

When to Seek Medical Evaluation

• New-onset generalized sweating (especially night sweats).
• Associated weight loss, fever, fatigue, lymphadenopathy.
• Sweating disrupts daily activities, work, relationships.
• Onset after starting new medication.

Management Overview

• Primary: Aluminum chloride antiperspirants, iontophoresis, oral anticholinergics (glycopyrrolate), botulinum toxin injections, microwave thermolysis (miraDry), sympathectomy (last resort).
• Secondary: Treat underlying condition; adjust medications.

A dermatologist or primary care provider can differentiate type and guide therapy.