Hyperhidrosis Hyperhidrosis is the medical term for excessive sweating. It refers to any abnormal sweating, such as sweating when it’s not hot. People who sweat excessively often soak through their clothing or drip sweat. Regular antiperspirants don’t work well for those with this condition. Treatments with Botox, Bocouture of Dysport are a new treatment option for people with hyperhidrosis.