This site is an encyclopedia of sweating – its anatomy, physiology and pathology. There is extensive information on conditions associated with excessive or decreased sweating. Excessive sweating in particular can be very disabling. As excessive sweat in the hands may make it impossible to play a musical instrument or pursue careers requiring contact with paper or electrical devices. Axillary hyperhidrosis damages clothes and plantar hyperhidrosis damages shoes. An overview of the treatments available for these and other conditions is given.