Definition
Sweating in the context of anxiety is perspiration produced by sympathetic nervous system activation, separate from the body's main thermoregulatory sweating. It tends to come on quickly, focuses on the palms, soles, underarms, and face, and is a frequent feature of panic attacks and acute social anxiety.
What it can feel like
Damp palms before shaking someone's hand. Sudden underarm wetness during a meeting. A flush of facial sweat during public speaking. Cold, clammy skin during a panic attack, sometimes severe enough that the person feels they need to step outside.
Why it happens
Apocrine and eccrine sweat glands respond to sympathetic nervous system signaling. Adrenaline activates these glands directly, which is why anxiety-related sweating can begin within seconds of a triggering thought. The sweat itself is part of a normal autonomic stress response. In otherwise healthy people, once medical causes such as thyroid disease, infection, hypoglycemia, and specific medication effects have been excluded, anxiety-driven sweating isn't a medical emergency. New-onset or pattern-changed sweating, particularly night sweats, drenching sweats, or sweating with weight loss or fevers, deserves medical evaluation. People with sustained or distressing patterns of social sweating sometimes benefit from treatment of underlying social anxiety, and primary hyperhidrosis (a separate condition not driven by anxiety) has its own dermatological treatments.
When to see a clinician
Anxiety-related sweating that comes only in clearly anxious moments is usually benign. Sweating that occurs at rest, that drenches clothing or sheets at night, or that's paired with weight loss or palpitations warrants a medical evaluation.