Hyperhidrosis can be divided into 2 types, depending on whether an obvious cause can be identified. These are known as primary and secondary hyperhidrosis. Primary hyperhidrosis. Hyperhidrosis that has no obvious cause is known as primary hyperhidrosis.
https://www.nhsinform.scot/illnesses-and-conditions/skin-hair-and-nails/hyperhidrosis