Hot & Cold Therapy Products Hot & Cold Therapy includes a variety of heat, ice and pressure point gel packs for specific body aches, pains and first aid.  Hot and cold packs can help reduce swelling, heal injuries, and relieve discomforts.    Cold therapy and ice packs should be applied during the first 72 hours following any type of acute injury.  These include sprains, surgery, and areas with swelling.  The cold therapy works by constricting the blood vessels and restricting flow of blood to affected areas.  Cold and Ice packs also numb the nerve endings and help dull pain associated with injuries.   Heat therapy and hot packs are usually warmed in the microwave and provide help for chronic health issues.  Heat therapy helps to open blood vessels and promote blood flow to affected areas.  The result is increased blood circulation , increased oxygen and nutrients to the muscles and surrounding tissue.