There are two main types of excessive sweating – primary and secondary. Each has different causes. Primary hyperhidrosis is hereditary, and often a relative will have the same or similar condition. Other than genetics being at work, there are often no obvious causes. This is normally localised to the hands, feet and face.
Secondary hyperhidrosis, however, has many known causes – heart disease, diabetes, obesity and anxiety being a few of them. This type of excessive sweating affects the entire body.
Hyperhidrosis can also cause night sweats. The effects are very similar to secondary hyperhidrosis, but happen whilst you’re asleep.