Why Do I Sweat So Much When I'm Nervous?

Eleven minutes before the presentation, a bead of sweat slides down the inside of your arm. You press your elbows to your sides, mentally rehearse your slides, and watch a dark circle spread through the silk blouse you chose because it looked professional.

Normal, or something more

The AAD² says people with hyperhidrosis sweat even when the body doesn’t need cooling, such as on a chilly day or while sitting in a temperature other people find comfortable. Many sweat heavily in one area, such as the palms, and other common places are the underarms, feet and head.

So two questions help. Do you sweat heavily only in stressful moments, or also when you’re calm and cool? And is it one spot, or all over?

Cleveland Clinic¹ describes two types. Primary focal hyperhidrosis is the most common, usually affects the armpits, hands, feet and face, and tends to start before age 25. Secondary generalized hyperhidrosis comes from another medical condition or a medicine. It estimates about 3% of US adults between 20 and 60 have hyperhidrosis. For the hands in particular, our article on sweaty palms goes deeper.

Why nerves do it

Heat isn’t the only thing that turns on sweat. The AAD³ says common triggers include heat, spicy foods and drinks, caffeine, and emotional states such as anxiety or stress. The NHS⁴ adds alcohol.

Odor can tag along. Cleveland Clinic¹ says body odor comes from sweat meeting the bacteria on your skin, and it lists stress among the contributing factors. Our article on smelling after a shower goes through the fixes.

What helps

Keep a sweat journal. The AAD⁵ recommends it. Write down when the heavy sweating happens and look for patterns, since heat, spicy food and drinks, caffeine, and anxiety or stress are common triggers. Once you spot yours, you can avoid some of them.

Use antiperspirant, not deodorant. The AAD⁵ says antiperspirants help reduce sweating and deodorants don’t. For a prescription antiperspirant, it says to apply it at night to dry skin, then again in the morning where your doctor recommends. The NHS⁴ says stronger antiperspirants are available without a prescription.

Dress for it. The AAD³ suggests breathable fabrics like cotton, spare dry clothes in your bag, and underarm or dress shields to protect clothing.

Drink water. The AAD³ says sweating can dehydrate you, and to ask your doctor how much water is right for you.

Look after the worry. The AAD³ says to address anxiety or depression related to sweating through counseling, support groups or learning more about the condition.

Treatments. If self-care isn’t enough, the AAD⁵ describes prescription antiperspirants, creams and cloths, oral medicines, injections of botulinum toxin, iontophoresis and other procedures. It notes that oral medicines such as glycopyrronium, oxybutynin or propranolol reduce sweating throughout the body or manage anxiety-related sweating, and that side effects include dry mouth and constipation. The AAD says a dermatologist will customize a plan to your type of hyperhidrosis and where it happens. It also says there isn’t a cure for hyperhidrosis, and that treatment can bring relief.

The play

Try this: a one-week sweat journal

Each time you notice heavy sweating, write the time, the place and what was going on: a meeting, a hot room, coffee, an argument, a spicy lunch.

Add whether it was one spot or all over, and if you were calm.

After a week, circle the common thread. Bring the page to a dermatologist if the pattern is nerves, and to your doctor if it isn’t.

When to get checked

The NHS⁴ says to see a GP if sweating lasts 6 months or more, happens weekly or nightly, affects your daily life, or runs in your family. Cleveland Clinic¹ says to contact a provider if sweating negatively affects your life, makes you avoid activities, gets progressively worse, or happens while you sleep. The AAD³ says a board-certified dermatologist can confirm what type you have.

Book an appointment if any of these fit:

• Sweating affects work, relationships or your confidence
• You’re avoiding situations because of it
• It’s getting worse, or it started suddenly
• You sweat heavily at night
• Antiperspirants and the habits above haven’t helped
• The worry about sweating is its own source of anxiety

Next time, eleven minutes before the presentation, you’ll have a journal, a plan and a spare blouse in your bag.