Hello, There are natural variations in how people sweat just as there are variations in other body functions. True excessive sweating goes beyond the normal physical need to sweat.( hyperhydrosis )  You sweat heavily for no reason- when it is not appropriate to the circumstances. There are two types of hydrosis. Localised Generalised Local excessive sweating generally takes place in underarms or face or head or feet and both sides of body are equally involved.Such type of sweating is generally normal. Generalised excessive sweating may be due to underlying medical conditions like Hyperthyroidism Diabetes Tubercular infections Alcoholism Rheumatoid arthritis Certain cancers etc. Anxiety Obesity Use of medications like certain psychiatric drugs,anti hypertensives,certain antibiotics eyc. The classical hallmark of generalised hyperhydrosis is excessive generalised sweating in night. consult a doctor  If sweating is asymmetrical If there are excessive night sweats If there is profuse general sweating Treatment will depend upon the cause found however for local sweating antiperspirants,Botox or certain medications can be given Thanks