The cause of hyperhidrosis is overactive sweat glands. There are two types of hyperhidrosis: generalized and focal.
In generalized hyperhidrosis (also known as secondary hyperhidrosis), excessive sweating occurs over the entire body. It is often caused by a medical condition such as an infection, a chronic disease, or a disorder that disrupts the body's natural balance of hormones. It may also be caused by medications (e.g., antidepressants).
Focal hyperhidrosis (also known as primary hyperhidrosis) occurs on a specific part of the body including the armpits, soles of the feet, palms of hands, face, or other areas. Genetics play a role as many people with focal hyperhidrosis have other family members with the condition. Hyperhidrosis is not a contagious condition.