Heating pad

A heating pad is a pad used for warming of parts of the body in order to manage pain. Such pads are now usually electrical or chemical, though in the past "hot water bottles" were used and sometimes still are.

Electric pads usually operate from household current and must have protections against overheating. Chemical pads employ a chemical heat reservoir (see sodium acetate) or a one-time chemical reaction such as catalyzed rusting of iron.