Hyperhidrosis: making sense of excessive sweating

When sweating becomes more than cooling down

Sweating in heat or during exercise is normal. Hyperhidrosis means excessive sweating that is not always related to those demands. It can leave clothing soaked or hands dripping, but its impact is not measured only by visible wetness: difficulty holding a pen, avoiding people or changing plans also matters. 1 2

Primary hyperhidrosis commonly affects the palms, soles, underarms and sometimes the face. The sweating often affects both sides and occurs while awake. That pattern can help a clinician, but it is not a home diagnostic test. See the focused guides to sweaty hands and head and face sweating for area-specific decisions. 1

Primary and secondary hyperhidrosis need different questions

In primary hyperhidrosis, nerve signals make sweat glands overactive without another medical condition causing it. It can run in families. Secondary hyperhidrosis is linked to a medical condition or medication and may affect much of the body. Possible causes include thyroid problems, diabetes, menopause and infections; a list of possibilities cannot identify your cause. 1

Tell your clinician about prescription medicines, non-prescription products and when symptoms started. If a medicine might contribute, discuss it with its prescriber rather than stopping it yourself. Treating a contributing condition or changing medication under medical supervision may help, although additional sweat treatment can still be needed. 2

When to get help, including urgent symptoms

Seek immediate medical attention for heavy sweating with dizziness, chest pain, or cold skin and a rapid pulse. These symptoms should not be treated as an ordinary hyperhidrosis episode. 1

Arrange an assessment if sweating suddenly increases, happens at night without an obvious reason, disrupts daily life or causes emotional distress. NHS guidance also recommends seeing a GP when self-care is not helping or you take medicine for another condition. You do not need to wait for symptoms to become unbearable. 1 3

For a routine appointment, write down where you sweat, how often, whether it happens during sleep and what you can no longer do comfortably. Bring your medication list and any family history. Examination or testing may be needed to investigate an underlying cause. 2

Choose treatments by body area and trade-offs

There is no single best treatment. Antiperspirants reduce sweat and are often an early option; deodorants mainly address odor. For hands and feet, iontophoresis uses a medical device and requires repeat sessions. Botulinum toxin injections can reduce sweating in treated areas temporarily. 2 4

Oral medicines may be considered when local treatments are insufficient or several areas are affected. They can cause dry mouth, constipation, blurred vision and difficulty emptying the bladder. Reduced sweating can also impair cooling in hot conditions, so that risk belongs in the prescribing discussion. Surgery is reserved for selected situations after other options; compensatory sweating elsewhere can be substantial. Ask about likely benefit, maintenance and harms rather than a promised cure. 2

A useful next step in the UK or US

Keep a short sweat diary to identify personal triggers rather than cutting out everything at once. Note what happened, the affected area and how it changed your activities. AAD guidance recommends this approach; NHS advice includes avoiding alcohol or spicy food if these worsen symptoms and choosing loose-fitting clothing. These measures can help daily life but do not replace assessment. 3 4

UK: a pharmacist can advise on stronger antiperspirants; a GP may refer you to dermatology if needed. NHS access varies by treatment, and botulinum toxin may not be available. US: discuss options with your clinician and check your plan's requirements before booking procedures. US treatment descriptions are not proof of UK availability or payment by either system. 2 3