Excessive sweating or hyperhidrosis is the condition were a person sweats more than they are comfortable with. It may happen when the weather or room is warm or when the person is stressed or embarrassed. Sometimes it happens for no apparent reason. It often begins to become a problem at puberty and increasingly worsens with age and certain life events such as getting a new job, pregnancy or menopause for example. 

It can occur in various areas of the body such as underarm, hands, feet, face or scalp. It can be upsetting and embarrassing for the sufferer and difficult to prevent or treat. Over the counter antiperspirants are ineffective or inappropriate for the area affected.