Hyperhidrosis : Causes for excessive nighttime sweating.

Sweat glands in the hands are predominantly under the control of the sympathetic nervous system and are stimulated by emotional stimuli. Therefore patients with hyperhidrosis usually do not have excessive sweating during sleep or sedation. Thermal sweating however can occur during sleep and is one of the more important causes of nighttime sweating.

Nighttime sweating however may also be related to secondary hyperhidrosis with an underlying cause. In patients with secondary hyperhidrosis, causes for nighttime sweating can be recognized and treated after a complete diagnostic work up by a qualified physician.