The exact cause of hyperhidrosis is not known. The sympathetic nervous system is the portion of the nervous system that controls the body’s energy and resources during stress or arousal stimuli.

Abnormal function of the central sympathetic nervous system may contribute to the development of hyperhidrosis.Therefore, when a person with focal hyperhidrosis experiences such stimuli (e.g. excitement or fear) their sweat glands produce even more perspiration. Up to two-thirds of people with the condition have a family history, suggesting that genes may be involved.
Some of the common triggers of Hyperhidrosis are: