Hot packs are a category of therapeutic applications that are used deliver a comfortable and prolonged exposure of heat to a specific and isolated area of the body when arthritic or painful, or when an increase of local blood circulation is appropriate. When a heat pack is used this way it is helpful in increasing local blood circulation and increase of blood endorphins.
Heat packs are normally made with a rubber "hot water bottle" filled with comfortably hot water, an electric heating pad, a gel material pack that that can be heated in hot water or a microwave heater, or by filling a clean cotton sock with rice and heating that in a microwave heater.
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