well the link http://www.medicinenet.com/script/main/art.asp?articlekey=57394 (should work properly - the blickie above doesn't but the text is correct)

says much but the only thing that appears to fit the co-factors is:
Idiopathic hyperhidrosis – Idiopathic hyperhidrosis is a condition in which the body chronically produces too much sweat without any identifiable medical cause.

So know I know!
Slag - does that make ya feel any better? Thought not.