We are supposed to sweat when we are hot do cool us down, so why cold sweats
"Cold sweats" refers to sudden sweating that does not come from heat or exertion. The medical term for cold sweats is diaphoresis. Cold sweats can come from the body responding to stress, referred to as a "fight or flight" response (fear). It's important to recognize cold sweats during first aid. Cold sweats can be a sign of significant injury or illness, such as sudden change in blood sugar or adrenalin levels. If a person has cold sweats without a related event, their doctor should be consulted.