Condition

Hyperhidrosis

Hyperhidrosis is sweating far more than the body needs to stay cool. It usually affects the underarms, palms, soles or face, and there is a clear treatment ladder that starts with an antiperspirant used correctly and goes up from there.
Dr. Schwarz, MD · Board-certified dermatologistLast reviewed September 8, 2026
16:9 hero for Hyperhidrosis. Never cropped: the tone strip and the corner logo depend on the full frame.

Start here

Heavy sweating is a medical condition, not a nerves problem and not a hygiene problem — the sweating comes first, and the dread of it follows. Almost everyone who tells me antiperspirants do not work has been using them in the morning on damp skin, which is close to the worst way; they belong on completely dry skin at night, and I want that tried properly for two weeks before we discuss injections or tablets. Sweating that starts suddenly in adulthood, covers your whole body, or wakes you soaked at night is a different problem from the kind that starts in childhood on the palms and underarms. That version needs a look for a cause, not a stronger antiperspirant.

— Dr. Schwarz, Board Certified Dermatologist

Key Facts

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How commonEstimates put it at roughly 3 to 5 percent of people, and most of them never raise it with a doctor
Who gets itPrimary hyperhidrosis usually starts in childhood or the teenage years, affects both sides equally, and often runs in families
Curable or managedManaged - treatment controls it well, but sweating returns when treatment stops
Prescription neededNot always. A strong antiperspirant used correctly is enough for a fair number of people
Time to improveAbout one to two weeks for antiperspirants, a few days to a week for botulinum toxin injections

What It Is

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Hyperhidrosis means sweating beyond what the body needs for cooling. Skin has millions of small sweat glands, called eccrine glands, packed most densely on the palms, soles, underarms and face. Sympathetic nerves switch them on. The glands are normal. The signal reaching them is turned up.

There are two forms, and telling them apart comes first.

Primary focal hyperhidrosis is the common one. It hits specific areas — usually underarms, palms, soles, face and scalp — in a matching pattern on both sides. It starts in childhood or around puberty, often runs in families, and stops during sleep. No illness drives it. The wiring is set high.

Secondary hyperhidrosis is caused by something else: a medicine, an overactive thyroid, a hormonal shift such as menopause, low blood sugar, an infection, a nerve injury, or rarely something more serious. It looks different — the whole body rather than a few areas, often during sleep, starting in adulthood.

The primary form is easy to underestimate from outside. Dripping palms make handwriting, tools, phones and handshakes difficult. Underarm sweat ruins clothes and dictates what people wear and where they sit. Wet feet cause slipping, odor and repeated fungal infections. People with hyperhidrosis rate its effect on daily life alongside conditions treated far more aggressively.

Symptoms

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Soaking through clothes

Underarm

Sweating from the armpits far beyond what heat or effort explains, marking clothing within minutes. It usually starts in the teens or twenties. Ordinary antiperspirant is often not enough and stronger options exist.
Dripping palms and soles

Hands and Feet

Palms and soles that are wet enough to drip, smudge paper or slip on surfaces, often triggered by stress as well as heat. It can affect work and handshakes more than health. Both areas are usually affected together.
Sweating that is new or all over

Whole-Body or New

Sweating all over the body, or sweating that has started recently, especially at night or with weight loss or fever. This pattern can point to a medical cause or a medicine rather than the usual type. New generalised sweating should be checked.

Where It Shows Up

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Front view of a whole body with red marks in both armpits, on both palms and on both soles. The rest of the body is clear.
Underarms, palms and soles
Primary hyperhidrosis picks a few areas and usually affects both sides about equally. These are where sweat glands sit most densely. Sweating spread over the whole body, or sweating that wakes you at night, is a different pattern and points to another cause.
Front view of a head with red marks across the scalp and forehead and on the upper lip.
Face and scalp
The face and scalp are the fourth common site, and the hardest to hide. Sweat beads on the forehead and upper lip and runs from the hairline with no heat and no effort behind it.

What Happens in the Skin

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This is what is going wrong under the skin, in the order it happens. Click a step to see it.

How Hyperhidrosis happens
Skin basics
BARRIEREPIDERMISDERMISSWEAT GLAND0NORMAL SWEATING1THE SIGNAL LEAVES THE BRAIN2THE MESSAGE REACHES THE GLAND3SWEAT PUSHED UP THE DUCT4WET SKIN, AND WHAT FOLLOWS

A nerve runs from the brain to each sweat gland in the skin. It sends a signal only when the body needs cooling, so the gland pushes up just enough sweat to evaporate off the surface. Between those moments the skin stays dry.

The part of the brain that handles temperature and emotion sends a signal down the spinal cord and out along the sympathetic nerves to the skin. In hyperhidrosis this signal is simply set too high, so ordinary things set it off at a volume most people's does not.

Where the nerve meets the sweat gland it releases a chemical messenger called acetylcholine. That is the switch that turns the gland on, and it is the step that injections, wipes and tablets are aimed at.

The gland squeezes sweat up a narrow duct to the surface. There is nothing wrong with the gland and there are not more of them than normal. This is the step an antiperspirant blocks, by forming a plug just inside the duct.

Sweat reaches the surface faster than it can evaporate, so the skin stays wet. That constant wetness is what softens skin, causes odor, ruins clothes and lets athlete's foot take hold. Almost everything on the lists below is pushing on one of these four steps.

The outer film of dead cells and oil. It holds water in and keeps irritants out, and it is thinner than a sheet of paper. Almost every dry, itchy, stinging skin problem starts here.

The outer layer, and the only one anything in a jar reaches. It renews itself constantly: a cell made at the bottom takes about a month to reach the surface and flake off. Most of what a skincare product does, it does here.

The living layer underneath, holding the blood vessels, the nerves and the collagen. It is where lasting change happens and it is hard to reach: most of what is sold for the skin never gets this far.

Every treatment interrupts this pathway at a different point.

The signal starts in the part of the brain that handles temperature and emotion, runs down the spinal cord, and out along the sympathetic nerves to the skin. At the gland, the nerve releases a chemical messenger called acetylcholine. The gland pushes sweat up its duct onto the surface. That last step is what you feel.

In primary hyperhidrosis nothing in that chain is diseased. No extra glands, no abnormal glands. The signal is set too high, and it fires at ordinary things — a warm room, mild nerves, a spicy meal.

Because the trigger is a nerve signal rather than an injury or infection, the sweating switches off during sleep, when that part of the nervous system quiets down. That is one of the clearest ways to tell the primary form from sweating caused by something else.

Secondary hyperhidrosis is driven from outside — a medicine, a hormone, a fever, low blood sugar, a damaged or rerouted nerve. Treat the cause and the sweating usually settles.

Risk Factors

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Most of this was set before you had any say. Some items below raise the odds of the primary form; the rest point to a secondary cause.

Inherited & age
Family history
A parent, sibling or child with it is one of the strongest clues it is primary.
Inherited & age
Starting young
It begins in childhood or the teens. Palms and soles first, underarms around puberty.
Hormones & anxiety
Anxiety
It runs both ways. Anxiety raises sweating, unpredictable sweating raises anxiety. Treating the sweating helps both.
Hormones & anxiety
Hormonal change
Menopause is the clearest example, with hot flashes and night sweats. Some sweat more in pregnancy.
Medicines
Some medicines
Certain antidepressants, some pain and diabetes medicines, drugs for dementia and glaucoma. Never stop one on your own — ask your doctor.
Other health conditions
An overactive thyroid
A common treatable cause of new whole-body sweating, with weight loss, a fast heartbeat and heat intolerance.
Other health conditions
Low blood sugar
Sudden sweating with shakiness, hunger and confusion, especially if treated for diabetes.
Other health conditions
Infections and, rarely, cancers
Sweating with fevers, weight loss or feeling unwell needs a look. Lymphoma is uncommon but is why.
Other health conditions
Nerve conditions and injuries
Parkinson's disease, spinal cord injury and nerve damage change how sweating is controlled, often in an odd pattern.
Other health conditions
Previous surgery near a salivary gland
Nerves regrow wrongly, so one cheek sweats and flushes while eating. This is Frey syndrome.

Course

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Primary hyperhidrosis runs a long, predictable course. The stages below are untreated — antiperspirants, injections and tablets control it well while used, and sweating returns to its old level within days to months of stopping. Secondary hyperhidrosis follows its cause and often resolves when that is treated.

ChildhoodBefore puberty
The first signs

Sweaty palms and feet, noticed as smudged homework, slippery hands in sport, or shoes that wear out fast. It gets mistaken for shyness.

PalmsSoles
TeensPuberty to early twenties
The peak, and the hardest years

Underarm sweating starts or worsens. Clothing, social life and career decisions get shaped around it.

Underarms
Young adultTwenties to forties
It settles at a steady level

It barely changes year to year. This is when people finally seek treatment, often after a decade of managing alone.

Midlife and laterForties onward
Gradual easing

Sweating becomes less intense with age. It rarely disappears.

Palms

What Makes It Better & Worse

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Hyperhidrosis is not one problem, it is four — the nerve signal, the chemical message, the gland pushing sweat up its duct, and the wet skin that follows. Treatments work at different points in the chain, and so do the mistakes. An antiperspirant on wet skin fails at step three however strong it is.

What is driving yours?

FATSWEAT GLANDBARRIEREPIDERMISDERMIS

The part of the brain that handles temperature and emotion sends a signal down the spinal cord and out along the sympathetic nerves to the skin. In hyperhidrosis this signal is simply set too high, so ordinary things set it off at a volume most people's does not.

Where the nerve meets the sweat gland it releases a chemical messenger called acetylcholine. That is the switch that turns the gland on, and it is the step that injections, wipes and tablets are aimed at.

The gland squeezes sweat up a narrow duct to the surface. There is nothing wrong with the gland and there are not more of them than normal. This is the step an antiperspirant blocks, by forming a plug just inside the duct.

Sweat reaches the surface faster than it can evaporate, so the skin stays wet. That constant wetness is what softens skin, causes odor, ruins clothes and lets athlete's foot take hold. Almost everything on the lists below is pushing on one of these four steps.

What helps

  • Surgery to cut the sympathetic nerve The last resort; most then sweat more elsewhere.
  • Treating anxiety Where dread of sweating is its own problem, treat both.

What makes it worse

  • Heat and humidity The ordinary trigger, and why people book in summer.
  • Stress and social pressure Exams, presentations, interviews, first meetings.
  • Dreading the sweating itself Worry about sweat raises the signal.
  • Spicy food, caffeine, alcohol, nicotine All raise sweating; spicy food hits the face in minutes.
  • Some medicines Certain antidepressants and pain medicines increase sweating.
  • An untreated overactive thyroid Whole-body sweating no skin product will fix.

What helps

  • Glycopyrronium cloth for underarms A prescription wipe once a day, away from the eyes.
  • Botulinum toxin injections Small injections in a grid, working within a week, lasting months.
  • Anticholinergic tablets Glycopyrrolate or oxybutynin, reducing sweating everywhere.

What helps

  • An aluminum antiperspirant at night Bone-dry skin, overnight, washed off in the morning.
  • Clinical strength versions Over the counter and much stronger. Try these next.
  • Prescription aluminum chloride The usual next step, every second or third night.
  • Iontophoresis for hands and feet Hands or feet sit in trays with a weak current.
  • Microwave treatment of the underarm An in-office procedure that destroys underarm glands.
  • Wicking socks and rotated shoes Plus antiperspirant on the soles.

What makes it worse

  • Applying antiperspirant in the morning Damp skin and active glands wash it out.
  • Applying it to damp skin Aluminum chloride reacts with water and irritates more.
  • Stopping the first time it stings Ease the schedule, do not quit.
  • Using a deodorant to reduce sweat Deodorant handles odor, not sweat.

What helps

  • Absorbent underarm liners They change how much shows and what gets ruined.
  • The fungal infection or the odor Athlete's foot and underarm odor each need treatment.

What makes it worse

  • Shaving, then treating that night The recipe for a burning underarm.
  • Closed shoes and synthetic socks Trapped moisture means macerated skin and athlete's foot.
  • Wearing the same shoes every day Shoes need about a day to dry.
  • Sitting in damp clothes Prolonged wetness causes rashes in the folds.

How These Treatments Work

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Treatments for Hyperhidrosis do not all work in the same place. Tap one to see where it acts.

Pick a treatment
Skin basics
BARRIEREPIDERMISDERMISSWEAT GLANDPLUGS THE DUCTBLOCKS THE MESSAGEBLOCKS THE MESSAGEBLOCKS IT BODY-WIDEQUIETS THE DUCTREMOVES THE GLANDS

Forms a temporary plug in the sweat duct. Applied at night, on dry skin.

Stops the nerve signal reaching the gland where it is applied.

The same target, by injection, and it lasts several months.

For sweating in too many places to treat one at a time. Dry mouth is the usual limit.

For hands and feet. It needs repeating to keep working.

Permanent, and kept for when everything else has failed.

The outer film of dead cells and oil. It holds water in and keeps irritants out, and it is thinner than a sheet of paper. Almost every dry, itchy, stinging skin problem starts here.

The outer layer, and the only one anything in a jar reaches. It renews itself constantly: a cell made at the bottom takes about a month to reach the surface and flake off. Most of what a skincare product does, it does here.

The living layer underneath, holding the blood vessels, the nerves and the collagen. It is where lasting change happens and it is hard to reach: most of what is sold for the skin never gets this far.

Over-the-Counter Products

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Everything here you can buy without seeing anyone.

Aluminum antiperspirant at night
Aluminum antiperspirant at night
Strong evidence
The first and most important treatment, and the one most people are using wrongly. It has to go on completely dry skin at night, when sweating is lowest, so the aluminum can settle into the duct and form a plug; washed off in the morning, the plug stays. Used in the morning on damp skin it is rinsed out before it works. Give it two weeks. It works on soles and palms as well as underarms.
Clinical strength antiperspirant
Clinical strength antiperspirant
Strong evidence
Sold over the counter and considerably stronger than an ordinary antiperspirant, so it is the sensible next step before anything is prescribed. Same rules apply: dry skin, at night, washed off in the morning. If it stings, drop to every second or third night rather than stopping — irritation usually means the schedule needs easing, not that the product is wrong.
Liners, wicking socks, spare shoes
Liners, wicking socks, spare shoes
Limited evidence
None of this reduces sweating, but it changes how much of it shows and how much damage it does. Absorbent underarm liners protect clothes, moisture-wicking socks pull sweat off the skin, and having two pairs of shoes so each dries for a full day cuts the odor and the athlete's foot considerably. Worth doing alongside treatment, not instead of it.
Deodorant
Deodorant
Weak evidence
A common and costly mix-up. Deodorant works on the bacteria that turn sweat into odor; it does not block sweat at all. If the label says deodorant only, it will do nothing for how wet you get. Many products combine both, so check that the word antiperspirant is on it.

Prescriptions

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These need a prescription.

A white small dropper bottle on a white background, with a plain white label reading Aluminum Chloride and a blue swoosh beneath it.
Aluminum chloride 20%
Strong evidence
The prescription-strength version of the same idea, and the usual next step when clinical strength has not been enough. It is started every second or third night rather than nightly, because stinging and redness are common. Apply to bone-dry skin, and never on the night you shave — that combination is the classic cause of a burning underarm.
16:9 hero for Qbrexza. Never cropped: the tone strip and the corner logo depend on the full frame.Diagram: how Qbrexza works in the skin
Strong evidence
A prescription glycopyrronium wipe used once a day on the underarms. It blocks the chemical message from the nerve to the gland, which is a different step from an antiperspirant, so it is an option when aluminum has failed or is too irritating. Wash your hands afterwards and keep it well away from the eyes — touching the eyes after using it causes blurred vision and an enlarged pupil.
An amber prescription bottle lying on its side on a white background with a plain white label reading Glycopyrrolate, and six small round white tablets spilled out in front of it.
Glycopyrrolate
Moderate evidence
A tablet that blocks the same chemical message everywhere in the body at once, which makes it the option when sweating affects several areas or the whole body rather than one patch. The trade-off is that it dries everything: dry mouth, dry eyes, blurred vision and constipation are common, and it reduces your ability to cool down, so it needs care in hot weather and heavy exercise.
An amber prescription bottle lying on its side on a white background with a plain white label reading Oxybutynin, and six small round white tablets spilled out in front of it.
Oxybutynin
Moderate evidence
The main alternative tablet, usually started low and built up slowly to find the point where sweating drops before dry mouth becomes intolerable. It works the same way as glycopyrrolate and has the same trade-offs. It is used more cautiously in older adults, where it can cause confusion.
An amber prescription bottle lying on its side on a white background with a plain white label reading Propranolol, and six small round white tablets spilled out in front of it.
Propranolol before an event
Limited evidence
A beta blocker taken as a one-off before a presentation, an interview or a performance. It blunts the physical side of nerves — the racing heart, the shaking and some of the sweating — so it suits people whose worst sweating is tied to specific occasions. It does nothing for everyday sweating and is not a treatment for the condition itself.

Procedures

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These are done in the office, usually over several visits.

Iontophoresis
Strong evidence
Hands or feet sit in shallow trays of water while a weak electrical current passes through them, about 20 to 30 minutes a session. It is the best option for palms and soles, where antiperspirants are hardest to keep on. It takes several sessions a week at first, then a maintenance session every week or two, and it stops working if you stop. Machines can be bought for home use, which is how most people end up doing it.
16:9 hero for Botox (Botulinum Toxin). Never cropped: the tone strip and the corner logo depend on the full frame.
Botox (Botulinum Toxin)
Strong evidence
A grid of small injections that block the nerve signal reaching the sweat glands in that patch of skin. It starts working within a few days to a week and lasts several months before it needs repeating. Underarm injections are well tolerated; palms and soles hurt more and are usually done with numbing, and palm injections can cause temporary weakness of grip. It is an approved medical treatment for severe underarm sweating, not a cosmetic one, and insurance often covers it once antiperspirants have been tried and documented.
miraDry (microwave treatment)
Moderate evidence
An in-office treatment that uses microwave energy to destroy the sweat glands in the underarm, so the reduction is permanent rather than repeating like injections. It is for underarms only. Most people need one or two sessions, the underarms are swollen and tender for a week or two afterwards, and temporary numbness in the upper arm can happen. It is not usually covered by insurance.
Sympathectomy surgery
Moderate evidence
Keyhole surgery that cuts the sympathetic nerve in the chest. It reliably and permanently stops palm sweating, which is why it is still done. The problem is that a large share of people go on to sweat far more heavily on the trunk, back or legs, and that cannot be undone. It is reasonable to consider only for severe palm sweating after antiperspirants, iontophoresis, injections and tablets have all genuinely been tried.

When to See a Dermatologist

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Two very different reasons bring people in about sweating. Get checked promptly if the sweating is new in adulthood, covers your whole body, or wakes you soaked at night, and the same if it comes with fever, unexplained weight loss, a racing heartbeat, shakiness or feeling unwell, because that points at a cause worth finding. Book an ordinary appointment if sweating in one area costs you something concrete — ruined clothes, trouble writing or using tools, avoided handshakes, slipping in shoes, repeated foot infections — or if two weeks of a clinical-strength antiperspirant used correctly at night has not helped. Most of the visit is talking, plus a medicine review, usually thyroid and blood sugar tests, and a short severity score insurers often require before covering injections, so answer it carefully.

— Dr. Schwarz, Board Certified Dermatologist

Complications

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Athlete's foot and foot odor

Feet that stay wet inside shoes are ideal ground for fungus, so athlete's foot comes back again and again in people with sweaty soles, and the odor comes from bacteria working on the trapped sweat. Both are treatable in their own right, but they keep returning while the wetness is untreated. Antiperspirant works on the soles as well as the underarms, and rotating shoes so each pair dries for a day makes a real difference.

Macerated skin and skin-fold rash

Skin that is wet for hours at a time swells, turns soft and white, and starts to break down. In the underarms, the groin and under the breasts this becomes a sore, weeping rash in the crease, which then gets colonised by yeast or bacteria. It is common and it settles once the area is kept dry, but on deeper skin tones the soreness looks brown or violet rather than red and is often judged milder than it is.

Compensatory sweating after surgery

Cutting the sympathetic nerve reliably stops palm sweating, but a large share of people then sweat much more heavily somewhere else, usually the trunk, back or thighs. It can be worse than the problem they started with, and it cannot be reversed. This is the reason surgery sits at the very end of the ladder, after antiperspirants, iontophoresis, injections and tablets have all been genuinely tried.

Lookalikes

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Hidradenitis Suppurativa

Both sit in the underarms and groin, and hidradenitis suppurativa is still widely described as a sweat gland disease, so the two get confused. The difference is what you can feel. Hidradenitis makes deep, painful lumps and boils that come and go in the same spots, and over years it leaves tunnels and scars. Hyperhidrosis leaves the skin wet and nothing else — no lumps, no pain, no scarring.

Contact Dermatitis

This is the one that turns up while hyperhidrosis is being treated. A sore, itchy, flaky underarm gets read as the sweating causing a rash, when it is a reaction to the strong antiperspirant. The clue is the shape: it covers exactly where the product went and stops at that edge, it itches and stings rather than just feeling wet, and it settles within days of spacing the applications out.

Rosacea

Facial hyperhidrosis and rosacea share the same triggers — heat, spicy food, alcohol, stress and embarrassment — and both make the face the thing people notice, so one gets taken for the other. Rosacea shows as color: lasting redness across the cheeks and nose, visible small vessels, sometimes bumps. Facial hyperhidrosis shows as wetness, with the skin returning to its normal color once you cool down.

Myths

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  • "Excessive sweating is just nerves." Anxiety makes any sweating worse, but in primary hyperhidrosis the wiring is set high to begin with. People sweat heavily in situations they find relaxing, and it usually starts in childhood, long before anyone is anxious about it. Treating the sweating often reduces the anxiety.
  • "Antiperspirants cause breast cancer or Alzheimer's disease." These claims have been examined repeatedly and the evidence does not support them. Major cancer and health organizations have reviewed the question and found no link.
  • "Blocking sweat is unhealthy because it traps toxins." Sweat is mostly water and salt. The liver and kidneys handle detoxification, not the skin. Antiperspirants affect only a small fraction of the body's sweat glands.
  • "Deodorant and antiperspirant are the same thing." They are not. Deodorant targets the bacteria that turn sweat into odor. Antiperspirant blocks the duct so less sweat comes out. Many products do both, but a deodorant alone will not reduce sweating.
  • "Botulinum toxin for sweating is a cosmetic treatment." It is an approved medical treatment for severe underarm hyperhidrosis, and insurance often covers it once antiperspirants have been tried and documented. Rules vary by plan and country, so ask.
  • "Surgery is the definitive cure." Cutting the sympathetic nerve does stop palm sweating, but a large share of people then sweat more heavily on the trunk, back or legs. That compensatory sweating can be worse than the original problem and cannot be undone.
  • "If you sweat this much, something must be seriously wrong with you." Primary hyperhidrosis is not a sign of disease. What deserves investigation is sweating that starts suddenly in adulthood, covers the whole body, happens during sleep, or comes with fever, weight loss or feeling unwell.

Questions Patients Ask

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Is hyperhidrosis dangerous?

The primary form is not dangerous in itself. Its costs are practical and social, plus skin problems from constant wetness - athlete's foot, rashes in folds, macerated skin. Sweating that is new, generalized, happens during sleep, or comes with weight loss or fever should be checked.

Why does my antiperspirant not work?

Usually because of when you use it. In the morning on damp skin, the active ingredient washes out of the duct before it settles. The same product at night on completely dry skin often works. If two weeks of that with a clinical-strength product has not helped, that is genuine failure, and time for prescription options.

How long do botulinum toxin injections last, and do they hurt?

They start working within a few days to a week and last several months. Underarm injections are well tolerated. Palms and soles are more uncomfortable and usually done with numbing, and palm injections can cause temporary hand weakness.

Will treatment make me stop sweating everywhere?

No. Antiperspirants, wipes and injections act only where applied, on a small share of your sweat glands. Tablets work body-wide, which is why they reduce heat tolerance and need care in hot weather or heavy exercise. You keep plenty of capacity to cool yourself.

Will it go away on its own?

Primary hyperhidrosis usually persists, though it often eases with age, particularly on the palms - controlled rather than cured. Secondary hyperhidrosis resolves once whatever drives it is treated.

Should I have the surgery?

For most people, no. It reliably stops palm sweating, but a large share then sweat more heavily elsewhere, usually the trunk, and that is permanent. Consider it only for severe palm sweating after antiperspirants, iontophoresis, injections and tablets have all been genuinely tried.

References

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