In a nutshell
Palms can become moist during excitement even when the rest of the body is not sweating heavily. If sweating markedly exceeds what is usual for the situation and interferes with daily life, palmar hyperhidrosis may be present. The primary form typically affects both hands and often begins early in life.
Why does it happen?
The palms contain a particularly high density of eccrine sweat glands. Sympathetic nerves activate them with the neurotransmitter acetylcholine; an exaggerated control response can trigger large amounts of sweat without there being more glands.
Frequency
Moist hands during excitement are common. Persistent excessive palmar hyperhidrosis affects only a portion of people and should not be equated with this ordinary response.
Frequency is a qualitative description, not your individual probability.
Is it normal?
Mild sweating during heat or excitement is normal.
When to seek advice
Nighttime whole-body sweating, weight loss, or a new marked increase should be assessed.
Does this happen to you?
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Sources (1)
- Romero et al.: Palmar hyperhidrosis (opens a new tab)
This source supports the description and physiological context of this entry.
Editorial update: . AI-assisted research and editing; not individually reviewed by a physician. How we research
