Why do I sweat when I’m nervous?

You sweat when you’re nervous because your body activates the sympathetic nervous system, which is part of the fight-or-flight response.

When your brain senses stress or anxiety, it signals your sweat glands to start working. This can happen even if you’re not physically hot, because your body is preparing for possible action.

A few things are going on:

• Adrenaline and related stress signals rise, which helps increase alertness and readiness.
• Sweat glands turn on, especially the eccrine glands, which are the main glands involved in emotional sweating.
• In some areas like the armpits, apocrine glands can also contribute, and their sweat can smell stronger after skin bacteria break it down.

That’s why nervous sweating can happen during a presentation, interview, or stressful conversation, even if you’re sitting still.

If it’s happening a lot or feels hard to control, it may be worth talking with a doctor, since anxiety or hyperhidrosis can sometimes play a role.