What Causes Excessive Sweating?

Primary Focal Hyperhidrosis

This is one of the most common causes of excessive sweating, according to Mayo Clinic. The "focal" in the name refers to the focal points of the body where sweat shows up naturally, like the underarms, palms and face. It generally manifests as a symmetrical excess of sweat on the body (for instance, both palms, both soles of the feet, or both sides of the groin will produce too much perspiration). And don't worry — it's not a sign of nervousness or of serious illness.