Short answer: Focal hyperhidrosis is excessive sweating in specific areas of the body, most often the underarms, palms, feet and face, on both sides. It's the most common form of hyperhidrosis, usually starts in childhood or the teenage years, and is driven by an overactive nervous system rather than faulty sweat glands. Below you'll find the symptoms by body area, what causes it, how severity is measured, and the options people turn to, including the daily first step we recommend.
What is focal hyperhidrosis?
Focal hyperhidrosis, also called primary focal hyperhidrosis, means heavy sweating that is concentrated in certain parts of the body and isn't caused by another disease or medication. It accounts for around 93% of all hyperhidrosis cases, according to a 2025 review in Drugs in Context.
The word "focal" is the key. Unlike generalised sweating, which covers the whole body and often has an underlying medical cause, focal hyperhidrosis targets the areas with the highest density of eccrine sweat glands. If you're unsure which type you have, our guide to hyperhidrosis causes explains the difference.
Symptoms by body area
In a 2016 US survey of 1,985 people with hyperhidrosis, most had more than one area affected:
| Area | Medical name | Share affected | Typical signs |
|---|---|---|---|
| Underarms | Axillary | 68% | Soaked shirts, visible stains, changing clothes during the day |
| Palms | Palmar | 65% | Dripping hands, smudged paper, avoiding handshakes, slippery phone |
| Feet | Plantar | 64% | Slipping in sandals, wet socks, odour, ruined shoes |
| Face, groin, under the breasts | Craniofacial and others | 30%+ | Sweat running down the forehead, damp hairline, flushing |
The same research found that 81% of people with underarm sweating also had three or more other areas affected. Palm and foot sweating usually starts early: 66% of people with sweaty palms and 61% with sweaty feet noticed it before age 12, while underarm sweating more often begins around puberty.
Other common signs of focal hyperhidrosis:
- Sweating on both sides equally
- Episodes at least once a week
- Sweating that stops while you sleep
- A parent or sibling with the same problem
- Sweating triggered by stress, attention or nerves, not just heat
Recognise yourself? See how Voora supports both the sweat and the stress behind it →
What causes focal hyperhidrosis?
Your sweat glands aren't the problem. Studies show they're normal in size and number. The issue is the signal from the sympathetic nervous system, which releases acetylcholine to switch the glands on. In focal hyperhidrosis, that signal is simply turned up too high.
Genetics play a big role. Between 30% and 65% of people with focal hyperhidrosis have a family history, according to a 2026 clinical review in Medicine Today. In July 2026, Johns Hopkins researchers identified a gene variant that "turns up the volume" on the nerve signals that stimulate sweating.
Stress is the amplifier. Emotional pressure activates the same nervous system that is already overactive, which is why sweating peaks during meetings, dates and exams.
How focal hyperhidrosis is diagnosed
There's no blood test for it. Diagnosis is based on your history. A widely used set of criteria, summarised in American Family Physician, is visible, excessive sweating in specific areas for more than 6 months without another cause, plus at least two of the following:
- Bilateral and symmetrical
- Interferes with daily activities
- At least one episode per week
- Started before age 25
- Family history
- No sweating during sleep
The Hyperhidrosis Disease Severity Scale (HDSS)
Severity is often rated with a simple four-point scale introduced by an expert panel in Hornberger et al., 2004. Ask yourself how your sweating affects daily life:
- Never noticeable and never interferes
- Tolerable, sometimes interferes
- Barely tolerable, frequently interferes
- Intolerable, always interferes
Scores of 3 or 4 are considered severe.
How it affects everyday life
Focal hyperhidrosis has been called "the silent handicap" for good reason. It shapes the clothes people wear, the jobs they choose and whether they shake hands at all.
- Anxiety: in a study of more than 2,000 dermatology patients, anxiety was nearly three times as common in people with hyperhidrosis (21.3% vs 7.5%).
- Skin infections: a case-control study of 387 patients found that primary hyperhidrosis increases the risk of skin infections.
- Years of silence: 85% of people wait more than three years before raising their sweating with a professional, and half wait more than ten, according to the International Hyperhidrosis Society.
You don't have to wait ten years. Start with Voora today →
Options for focal hyperhidrosis
Here's how the common options compare:
- Clinical-strength antiperspirants: aluminium-based products plug sweat ducts where you apply them. They're often the first thing people try, but they only work on the surface, and the strongest formulas can irritate the skin.
- Iontophoresis: a device that passes a mild current through water, mainly used for hands and feet. It requires regular sessions.
- Botulinum toxin injections: block the nerve signal locally for several months, but must be repeated and can be costly.
- Oral anticholinergics: reduce sweating throughout the body, but commonly cause dry mouth and other side effects.
- Surgery (ETS): cuts the sympathetic nerve chain. It's permanent and carries a well-known risk of compensatory sweating elsewhere on the body.
Notice the pattern: most options either work only on the skin, or interrupt the nerve signal with injections, drugs or surgery. Very few address the everyday stress-sweat loop in a gentle, daily way.
Why Voora is the natural first step
Because focal hyperhidrosis starts in the nervous system and is amplified by stress, the most sensible place to start is a daily routine that supports both sides of the loop. That's exactly what Voora was designed for.
- Sage (300 mg): recognised by the European Medicines Agency as a traditional herbal remedy for excessive sweating.
- Ashwagandha (600 mg): lowered anxiety and morning cortisol in a 2019 placebo-controlled trial.
- Passion flower (100 mg): a traditional calming herb studied for anxiety.
- Pine bark (100 mg): improved hot flushes and night sweats in a 2013 trial of 170 women.
Quality matters too. A DNA study in BMC Medicine found that 59% of herbal products contained plants not listed on the label. Voora uses 100% pure extracts at full, clearly stated doses, with no fillers and no proprietary blends. Two capsules a day, one in the morning and one in the evening, with the best effect after one to two months of consistent use.
Unlike injections or surgery, you can start today, and you can combine it with everything else on this list.
What customers say
"The constant dampness under my arms and on my palms made me dread social situations. I don't think about it anymore."
James C.
"Hyperhidrosis isolated me more than anyone realized. Handshakes, paperwork, even walking in certain shoes became stressful. I feel free now."
Sofia V.
Join them. Try Voora with our 60-day money-back guarantee →
Daily habits that help with focal sweating
- Underarms: apply antiperspirant at bedtime on completely dry skin, as recommended by the American Academy of Dermatology. Choose white, black or patterned fabrics.
- Palms: keep a cotton handkerchief handy and try slow breathing (four seconds in, six out) before handshakes.
- Feet: rotate shoes so they dry fully and wear moisture-wicking socks.
- Face: cut back on caffeine, spicy food and alcohol before important moments.
Find 12 more practical tips in How to stop sweating so much.
Frequently asked questions
What is the difference between focal and generalised hyperhidrosis?
Focal hyperhidrosis affects specific areas such as the underarms, palms, feet or face, usually on both sides, and has no underlying disease. Generalised hyperhidrosis affects the whole body and is more often linked to another condition or medication.
Is focal hyperhidrosis genetic?
Often. Between 30% and 65% of people with it have a family history, and a 2026 Johns Hopkins study identified a gene variant that strengthens the nerve signals behind sweating.
At what age does focal hyperhidrosis start?
Usually in childhood or adolescence. Most people with sweaty palms or feet noticed it before age 12, while underarm sweating often starts around puberty.
Does focal hyperhidrosis go away on its own?
It typically lasts for many years, which is why a consistent daily routine matters more than quick fixes.
What is the best first step for focal hyperhidrosis?
Start with what you can do every day: a daily plant-based foundation like Voora that supports both the sweat and the stress, combined with bedtime antiperspirant and fewer triggers.
Make Voora your daily foundation →
Sources
- Maazi M, Leung AKC, Lam JM. Primary hyperhidrosis: an updated review. Drugs in Context, 2025
- International Hyperhidrosis Society: Epidemiology of primary hyperhidrosis
- Hornberger J et al. Recognition, diagnosis, and treatment of primary focal hyperhidrosis, 2004
- American Family Physician: Review of hyperhidrosis diagnosis and management, 2018
- Medicine Today: Hyperhidrosis diagnosis, assessment and stepwise management, 2026
- Johns Hopkins Medicine: Excessive sweating may start in nervous system, 2026
- Primary hyperhidrosis increases the risk of cutaneous infection: a case-control study of 387 patients
- International Hyperhidrosis Society: Hyperhidrosis and mental health
- Lopresti AL et al. Ashwagandha and stress: a randomised placebo-controlled trial, 2019
- European Medicines Agency: Community herbal monograph on sage leaf
Customer reviews reflect individual experiences; results vary. This article is for general information only. These statements have not been evaluated by the Food and Drug Administration. Voora is not intended to diagnose, treat, cure or prevent any disease.
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