How can normal sweating be told from excessive sweating?
If sweating continues to disrupt daily life even without heat, exercise or emotion, excessive sweating is considered; assessing it is the doctor's task.
Primary hyperhidrosis usually affects limited areas such as the underarms, palms, soles or face, often begins at a young age and eases during sleep. Secondary hyperhidrosis can result from an illness or a medicine and is usually felt over the whole body.
Night sweats, weight loss, palpitations, fever or newly started widespread sweating may need medical assessment. In that case see a physician before thinking about a cosmetic method.
What causes excessive sweating?
The exact cause of primary hyperhidrosis is not known and it can run in families; secondary causes include thyroid disease, diabetes, infections, menopause and some medicines.
In the primary form the sweat glands are normal in number but are thought to respond too strongly to nerve signals. Stress and heat can increase sweating but are not the only cause.
Secondary causes are asked about and, if needed, blood tests or other investigations are requested. If an underlying cause is not treated, surface methods may not be enough.
Which methods are used?
Usually the simplest steps come first: aluminium-salt antiperspirant, then iontophoresis, botulinum toxin injections, oral medicines and, in selected cases, device or surgical methods.
Stronger antiperspirants containing aluminium salts are the first step and can irritate the skin. Iontophoresis passes a low current through water and is used mainly on palms and soles; it needs regular repetition. Botulinum toxin temporarily reduces the signal that stimulates sweat glands; the effect typically lasts months and needs repeating.
Oral anticholinergic medicines can cause side effects such as dry mouth in some people; their use and amount are set only by a doctor. For the underarm there are energy-based devices and small procedures targeting the gland, and in very selected cases nerve surgery; their benefits and possible lasting side effects should be discussed separately.
Which option stands out in which area?
For the underarm, antiperspirant and botulinum toxin are often discussed; for palms and soles iontophoresis stands out; for the face and scalp options are more limited and individualised.
Botulinum toxin for the underarm is explained in detail on the related pages. In the palm, injections can be more uncomfortable and carry a risk of temporary muscle weakness, so iontophoresis is usually tried first.
Facial sweating needs extra care with medicines and injections, because expression muscles can be affected. The plan is therefore made area by area.
What are the risks and limits?
No method removes sweating completely or every time; depending on the method, skin irritation, pain, temporary weakness, dry mouth or compensatory sweating may occur.
Local bruising and pain can follow injections. Lasting results such as increased sweating in other body areas (compensatory sweating) have been reported with nerve surgery, so it is considered only in carefully chosen people under specialist care.
Pregnancy and breastfeeding, infection at the injection site, nerve and muscle disorders and some medicines change the choice of method. Sharing this information with the doctor is part of safety.
When should a doctor be seen, and which specialist?
See a physician if sweating affects daily life, work or social life, began suddenly or comes with other symptoms; dermatology is often the first step.
If night sweats, unexplained weight loss, palpitations or fever accompany it, another specialty such as internal medicine may be needed. The doctor first assesses the cause, then discusses methods and alternatives with you.
At the first visit the onset, areas, medicines you take and what you have already tried are asked about. The result of no method can be guaranteed in advance.
Frequently asked questions
Does excessive sweating go away?
Primary hyperhidrosis can continue for a long time in many people; methods aim to reduce symptoms and do not always remove them completely.
How long does botulinum toxin reduce sweating?
The effect typically lasts months and needs repeating; the duration varies by person and area.
Is iontophoresis safe?
It can be used with suitable equipment in most people; if pregnant or with a pacemaker or metal implant, ask a doctor first.
Can sweating be a sign of another illness?
Yes, especially widespread or newly started sweating can be linked to thyroid disease, infection and other causes. A doctor's assessment is needed.
Is surgery necessary?
Not for most people. Surgery is considered only in carefully chosen people who do not respond to other methods, with its risks explained.
Sources (5)
- American Academy of Dermatology: Hyperhidrosis: Diagnosis and treatment
- British Association of Dermatologists: Hyperhidrosis (patient information leaflet)
- NHS (UK National Health Service): Excessive sweating (hyperhidrosis)
- Türk Dermatoloji Derneği: Hiperhidrozis (Aşırı terleme): Hasta Bilgilendirme Broşürü
- U.S. FDA (DailyMed, NLM): QBREXZA- glycopyrronium cloth (Prescribing Information) (2026)
This content is for general information and does not replace a personal medical assessment.