Excessive Sweating
Abnormally heavy perspiration not related to temperature or exercise.
TL;DR
Excessive sweating is usually primary hyperhidrosis — a benign nerve signalling issue that starts young and affects hands, feet or armpits symmetrically. Sweating that is new, one-sided, or happens at night needs investigation.
Overview
Primary focal hyperhidrosis is far more common than people expect and has a characteristic pattern: onset in childhood or adolescence, symmetrical involvement of palms, soles, armpits or face, at least weekly episodes, and complete cessation during sleep. It is not caused by anxiety, though it certainly generates it, and the underlying issue is excessive cholinergic signalling to eccrine glands rather than any gland abnormality. Treatment is a clear ladder and most people never climb past the first rung properly. Aluminium chloride antiperspirant applied at night to dry skin, when sweat glands are least active, is markedly more effective than morning application and is the single most common mistake in self-treatment. Beyond that: glycopyrrolate topically or orally, iontophoresis for hands and feet, botulinum toxin injections lasting six to nine months, and microwave thermolysis. Secondary hyperhidrosis behaves differently and matters more. Generalised sweating that begins in adulthood, occurs at night, or comes with weight loss, fever or palpitations should prompt evaluation for hyperthyroidism, diabetes with hypoglycaemia, infection including tuberculosis, lymphoma, phaeochromocytoma, menopause and medication effects — SSRIs and opioids are frequent culprits. Supplement evidence is close to nonexistent; sage has weak data for menopausal sweating and no serious evidence in primary hyperhidrosis.
Common Symptoms
- •Visible dripping from palms or soles
- •Sweat marks through clothing
- •Symmetrical armpit, hand or foot involvement
- •Difficulty gripping paper or tools
- •Skin maceration or fungal infection
- •Night sweats in secondary causes
Common Causes
- •Primary focal hyperhidrosis
- •Hyperthyroidism
- •Menopause
- •Hypoglycaemia in treated diabetes
- •Infection or lymphoma
- •SSRIs, opioids and other medications
- •Anxiety disorders
Root Causes
Excessive cholinergic sympathetic outflow to eccrine glands in primary hyperhidrosis, hyperthyroidism, hypoglycaemia, menopause, infection, lymphoma, phaeochromocytoma, anxiety disorders, obesity, and medications including SSRIs, opioids and cholinesterase inhibitors.
How It's Diagnosed
Diagnostic Markers
- Clinical criteria for primary focal hyperhidrosis
- Thyroid function tests
- Fasting glucose and HbA1c
- Full blood count and inflammatory markers
- Chest imaging if night sweats and weight loss
- Plasma metanephrines where episodic sweating with hypertension
When to See a Doctor
See a doctor for sweating that starts in adulthood, occurs at night, affects the whole body, or comes with weight loss, fever, palpitations or lumps. Drenching night sweats with weight loss require prompt evaluation.
Diet & Lifestyle
Suggested Pattern
No diet reduces primary hyperhidrosis. Reducing caffeine, alcohol and very spicy food lessens sweating episodes in some people, and weight reduction helps where obesity contributes.
Supporting Research
The etiology, diagnosis, and management of hyperhidrosis: therapeutic options
Topical glycopyrronium tosylate for the treatment of primary axillary hyperhidrosis: ATMOS-1 and ATMOS-2 phase 3 randomized controlled trials
A randomized placebo-controlled trial of oxybutynin for the initial treatment of palmar and axillary hyperhidrosis
Clinical evaluation of a microwave device for treating axillary hyperhidrosis
Black cohosh (Cimicifuga spp.) for menopausal symptoms
Frequently Asked Questions
Who It Affects
Primary hyperhidrosis affects roughly 3-5% of the population, with onset typically before age 25 and frequent underreporting.
Quick Facts
- •Primary hyperhidrosis stops during sleep; night sweating suggests a secondary cause
- •Aluminium chloride works far better applied at night than in the morning
- •Botulinum toxin for armpit sweating typically lasts six to nine months
- •SSRIs and opioids are among the most common drug causes of generalised sweating
Lifestyle Tips
- •Apply aluminium chloride antiperspirant to completely dry skin at bedtime, then wash off in the morning
- •Wear moisture-wicking natural fabrics and change socks midday for foot involvement
- •Ask about iontophoresis for hands and feet before considering injections
- •Review SSRIs and opioids with your prescriber if sweating started after a new medication
- •Treat associated fungal infection promptly; macerated skin is prone to it
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This information is for educational purposes only. Always consult a healthcare professional before starting any supplement regimen.