In short. Why treating the hands is harder than the underarm, and the real risk of temporary hand weakness after injection.
Key points
- Otherwise the side effects resemble those of the underarm: pain during injection, bruising, and small temporary bumps at the injection points.
- As with the underarm, the effect is temporary and the treatment has to be repeated, and no treatment of this kind works for everyone.
Treating the palms is a different problem from treating the underarm. The skin of the palm is thick and the sweat glands sit deeper, so the injection has to go deeper and a much larger total amount of toxin is needed across a larger surface. The palm is also one of the most sensitive areas of the body, so the injections are genuinely painful and some form of anaesthesia is used, which may be a nerve block at the wrist performed by a clinician or a topical anaesthetic applied beforehand. And the palm contains the small muscles that move the fingers, lying close to the glands being treated. That proximity creates the specific risk that matters here.
Temporary weakness of the hand
If the toxin reaches those small muscles, they can weaken. This shows up as a weak grip, difficulty pinching, dropping objects, or clumsiness with fine tasks. It is temporary and recovers as the effect wears off, usually over some weeks to a few months, but it is unpleasant, it can interfere with work and with driving, and it is the reason the palms are treated only by clinicians experienced in the technique.
The rest of the side effect profile
Otherwise the side effects resemble those of the underarm: pain during injection, bruising, and small temporary bumps at the injection points. Most settle within days. As with the underarm, the effect is temporary and the treatment has to be repeated, and no treatment of this kind works for everyone.
The soles
The same principles apply to the soles of the feet, with some added difficulty: the skin is even thicker, the total amount of toxin needed is high, the discomfort is significant, and there is a risk of temporary weakness affecting the foot and the way you walk. The feet are often treated after the hands, because the benefit there is usually less complete.
The honest summary
It works, the effect lasts several months, and it needs to be repeated. The hands carry a real risk that the underarms do not. The decision is a balance between how much the sweating interferes with your life and how much risk of temporary weakness you are willing to accept. If that risk is not acceptable to you, that is a legitimate answer, and there are other options to discuss.
Compensatory sweating may also occur at other sites, as it can with the underarm, and it should be part of the conversation before treatment rather than a surprise afterwards.
Questions worth asking first
- Who will perform the injections, and how much experience do they have with the palm?
- What will happen if my grip weakens, and how long should I expect it to last?
- How will the anaesthetic be given, and what are its own risks?
Frequently asked questions
Why is treating the palms harder than treating the underarm?
The skin of the palm is thick and the sweat glands sit deeper, so the injection has to go deeper and a much larger total amount of toxin is needed across a larger surface. The palm is also highly sensitive, so some form of anaesthesia is used, and the small muscles that move the fingers lie close to the glands.
What happens if my hand weakens after palm injections?
The small muscles of the hand can weaken if the toxin reaches them, showing up as a weak grip, difficulty pinching, dropping objects or clumsiness with fine tasks. It is temporary and recovers as the effect wears off over some weeks to a few months, but it can interfere with work and with driving.
Are the soles of the feet treated in the same way?
The same principles apply, with added difficulty: the skin is even thicker, the total amount of toxin needed is high, and the discomfort is significant. There is a risk of temporary weakness affecting the foot and the way you walk, and the feet are often treated after the hands because the benefit is usually less complete.
Risks & Limitations
- Antiperspirants and topical agents commonly cause stinging, redness, dryness and irritation, and occasionally an allergic rash that requires stopping the product.
- Oral anticholinergic treatment can cause dry mouth, blurred vision, constipation and urinary symptoms, and cognitive effects are a particular concern in older adults.
- Botulinum toxin for palmar sweating carries a real risk of temporary weakness of the small muscles of the hand, which recovers but can interfere with work and driving.
- Botulinum toxin treatment is temporary, lasting months rather than permanently, and must be repeated to keep working.
- Compensatory sweating — new sweating appearing elsewhere — can follow any treatment that stops sweating in one area.
- After sympathectomy, compensatory sweating is common, often permanent, and cannot be undone reliably.
- No treatment is curative for everyone, and response cannot be predicted with certainty.
When to Seek Care
- Night sweats, especially with unexplained weight loss, fever or drenching, need medical assessment.
- Sweating with chest pain, palpitations, breathlessness or fainting — seek urgent medical care.
- Sweating that is one-sided or clearly asymmetrical, or that starts suddenly in later life.
- Sweating with heat intolerance, tremor, a swelling in the neck, or a change in menstrual pattern.
- Skin that is red, cracked, macerated, weeping or infected, or a rash that follows a new product.
- Urinary difficulty, confusion or drowsiness while taking oral treatment for sweating.
References & Further Reading
- American Academy of Dermatology (AAD) — public and clinical guidance on hyperhidrosis
- International Hyperhidrosis Society — patient and clinician resources on excessive sweating
- Chinese Medical Association, Dermatology Branch — clinical guidance
- Cochrane Library — systematic reviews of interventions for hyperhidrosis
- National Institute for Health and Care Excellence (NICE) — guidance on the management of primary hyperhidrosis
This page is patient education, not medical advice, and it does not cite individual studies. Discuss your own case with a qualified clinician. To arrange an assessment at Chongqing West District Hospital, see Contact & Consultation.