The diagnosis of primary hyperhidrosis is mainly connected with a personal feeling that excessive sweating starts to interfere with one's personal or working life. Excessive sweating is usually diagnosed by a physician in case:

• excessive sweating bouts appear at least once a week
• there is no excessive sweating during sleep
• excessive sweating appears symmetrically all over the body (i.e. both hands, armpits, etc.)
• excessive sweating is only local
• there is no known direct cause of excessive sweating

The diagnosis of secondary hyperhidrosis is typically connected with the above mentioned diseases, physical states or the use of certain drugs, especially antidepressants.

For a more detailed diagnosis of areas with excessive sweating we can use a thermoregulation test where a powder is applied on the patient's body and an increase of humidity is signalled by a change in colour. Subsequently the patient is put into a thermoregulated room and the extent and speed of sweating is monitored.