Where hyperhidrosis comes from — and why it isn't "a personality trait"
Before we get to the myths, one fact that changes the whole conversation. Sweating is a function of the nervous system, not the gland. Sweat glands simply follow orders — and those orders come from sympathetic nerves. In primary hyperhidrosis, these nerves fire too intensely, without a clear external trigger. It's not "weak willpower", "too much coffee" or "not enough deodorant". It's a nervous system with too sensitive a trigger threshold, reacting with sweat where others wouldn't react at all.
Botulinum toxin works in a very simple way here: it blocks the nerve signal to the sweat gland in a specific location, reducing or fully stopping local sweat secretion. It changes nothing in the gland itself, doesn't enter the bloodstream and doesn't affect the hormonal system. The effect is local, precise and — importantly for anyone worried about irreversible decisions — entirely temporary.
Six myths that put people off treatment
Myth 1: "Blocked sweat moves elsewhere — to the back, the face, the chest." This is by far the most common fear, and by far the most misleading belief about the whole treatment. The body releases sweat through around 2–4 million glands spread across the entire body — the underarms are a tiny fraction of that system. The treatment only affects the glands the product actually reaches — literally a few square centimetres of tissue. The remaining glands receive no signal to work harder. Sweat isn't a fluid that circulates under the skin looking for a new outlet. Every gland works independently, based on its own nerve signal. There's no "redirection" mechanism.
Myth 2: "The body will overheat without sweat under the arms." Same logic, same mistake. Thermoregulation is a job for the entire sweat gland system — the body dissipates heat through the skin on the abdomen, back, chest, legs and forehead. Locally switching off a few square centimetres under the arm has no effect on the body's ability to maintain a normal temperature. If it did, this treatment couldn't be used on physically active people — yet nothing of the sort is seen in medical literature or in clinical practice.
Myth 3: "It's just cosmetic — it won't work for real hyperhidrosis." Actually, the opposite is true. Botulinum toxin for hyperhidrosis is one of the few methods with proven, high effectiveness in severe cases — not mild ones. Deodorants, higher-concentration aluminium antiperspirants, iontophoresis — these are earlier steps, which often fail in primary hyperhidrosis. Botox is recommended when other methods haven't given sufficient results. It isn't "cosmetics with extra steps" — it's medical treatment.
Myth 4: "The treatment hurts — injections go into very sensitive areas." This myth has some basis in reality — without preparation, the underarms, hands or feet are genuinely more sensitive than the forehead. That's why a good clinic always applies local anaesthesia before the treatment. With proper anaesthesia, sensations are minimal. Importantly, the discomfort is brief (the procedure itself takes a matter of minutes), while the effect lasts for months. The comfort-to-result ratio is quite different from what people first imagine.
Myth 5: "It's only for women — men with hyperhidrosis just have to live with it." Hyperhidrosis has no gender. Men develop it just as often — and in clinical practice, a stronger muscle build and a more demanding lifestyle can sometimes make the consequences more noticeable. Wet shirts at important meetings, damp handshakes, having to change clothes during the day — these genuinely affect confidence at work and in social life. The treatment works equally well regardless of gender.
Myth 6: "The effect wears off quickly — it's not worth the money." Botulinum toxin typically lasts longer on sweat glands than in aesthetic applications. While Botox for wrinkles lasts a few months, the effect on hyperhidrosis often lasts from six months to a year — and with repeated sessions, the duration can extend further. Calculated per month of comfort, the maths look quite different from an initial estimate.
Before you decide — what's worth knowing
If you have hyperhidrosis and are considering Botox treatment, a few practical points help you judge whether it's the right time. First of all: have other methods been genuinely tried? Higher-concentration aluminium salt antiperspirants, used regularly and as directed, are the first step. Only when they don't give sufficient results does the next step make sense — and it should happen in a precise medical setting, not a beauty salon.
The second consideration is where the problem is located. Botox for hyperhidrosis works best, and is most commonly used, under the arms — but it can also be applied to the hands and feet, though the procedure there is somewhat more demanding (stronger anaesthesia, more injection points). Before deciding, it's worth describing to the doctor exactly where and in what situations the problem occurs — it affects both the qualification and the technique used.
Finally: the effect doesn't appear immediately. The first changes in sweating are usually visible after a few days, with full results after around two weeks. This is a good point to check whether the whole area was covered adequately, or whether it needs a touch-up. A good clinic builds this follow-up visit into the standard procedure — not as an "extra service".
When it's worth talking to a doctor — instead of waiting
Hyperhidrosis comes in two forms. Primary appears without a clear cause, usually symmetrically (both underarms, both hands), often from a young age, and intensifies with emotion or exertion. Secondary is a symptom of another condition (thyroid disorders, diabetes, infection) or a side effect of medication — and requires treating the underlying cause first. So with new, sudden or worsening sweating, it's worth starting with a general medical consultation, not injections straight away.
If, however, you've had hyperhidrosis for years, you know it's "just how you are", you've been considering treatment for a while, and these exact myths have put you off — this is a good moment to book a consultation and get an assessment of your specific case. Medicine has a straightforward answer where the internet mostly offers fear.