Excessive Sweating (Hyperhidrosis)

When is sweating a medical condition?

The comprehensive JAAD review frames primary focal hyperhidrosis as a distinct disorder: focal, symmetric sweating of the underarms, palms, soles or face, typically beginning in adolescence, often familial, and switched off during sleep [1]. The diagnostic literature emphasises that it is a clinical diagnosis — history and pattern, with standardised severity scales rather than any single lab test [2]. The distinction that matters medically: sweating that is generalised, new in adulthood, nocturnal or accompanied by other symptoms is secondary until proven otherwise, and gets investigated for underlying causes before anyone treats the sweat itself.

The cost nobody audits

Hyperhidrosis's quality-of-life burden is repeatedly measured as severe — on par with major chronic skin disease — across work, social life and clothing choices [1]. Patients engineer their lives around it: dark shirts only, jackets in the tropics, avoided handshakes, keyboards wiped hourly. Because it is invisible as a “medical” problem, most sufferers spend years assuming it is a personal failing. It is a treatable neurophysiological pattern, and naming it as such is half the relief.

What actually works for hyperhidrosis?

Evidence supports a ladder [1]. Clinical-strength aluminium-chloride antiperspirants, correctly applied at night, are the true first step and underused. Iontophoresis has good data for palms and soles. Botulinum toxin injections — a medical use of the same molecule, blocking the nerve-to-gland signal — carry strong evidence for underarm sweating, with effect lasting months per cycle. Energy-based approaches aim to reduce the gland population in the underarm more durably. Oral medications and, rarely, surgery occupy the far end for refractory cases. Underarm sweating, odour and related concerns are assessed together in the underarm programme — the right rung depends on site, severity and your tolerance for maintenance.

What doesn't work for hyperhidrosis?

More showers — hyperhidrosis is signalling, not hygiene, and overwashing irritates the very skin being treated. Regular-strength antiperspirant applied in the morning — timing and concentration are the two reasons it failed you. Powders and absorbent pads — containment, not treatment. And white-knuckling social situations — anxiety and hyperhidrosis feed each other, but treating the sweat is the fastest way to break that loop for most focal cases.

“Primary hyperhidrosis is a wiring pattern, not a hygiene problem — you cannot shower away a signal the nervous system keeps sending.”

— Dr Sin Yong

Dr Sin Yong’s Viewpoint

Hyperhidrosis patients have usually spent a decade engineering their lives around sweat — dark shirts, jackets in the tropics, avoided handshakes — while assuming it was a personal failing. It is a wiring pattern with a proper treatment ladder, and naming it as a medical condition is half the relief. The other half is that the ladder works.