Excessive sweating, also known as hyperhidrosis, is a medical condition that happens when a person sweats more than necessary.
People with hyperhidrosis sweat when the body does not need cooling, says the American Academy of Dermatology.
Many people with hyperhidrosis sweat from their palms, feet, underarms or head. The condition can interfere with daily activities, and cause unsightly sweat marks.
Treatment options range from antiperspirants to Botox injections to prescription medicine.