Hyperhidrosis can either:
• only affect certain parts of the body, most commonly the armpits, hands, feet or face; this is known as focal hyperhidrosis
• affect the entire body, known as generalised hyperhidrosis
Sometimes hyperhidrosis has no obvious cause, although many experts believe that problems with the nervous system may be responsible. This is reffered to as primary hyperhidrosis. Most cases of generalised hyperhidrosis have an underlying cause, such as:
• it can be a side effect of taking medication
• it can be related to another condition, such as an overactive thyroid gland
Doctors may refer to this as secondary hyperhidrosis.