Cold and hot compresses are emergency treatments for different situations and need to be applied in the right way according to the actual situation. If you encounter the early stage of the injury, you need to apply cold compresses, which can constrict the capillaries, reduce the blood circulation of the injured area, control the bleeding situation, and cold compresses can also relieve the symptoms of wound pain. Cold compresses are generally taken within twenty-four hours of the occurrence of the wound, can play an effective effect. For hot compresses, generally after twenty-four hours of injury measures, you can use hot towels or hot water bags, external compresses on the wound, can promote blood circulation, conducive to wound healing. Hot compresses are generally taken twenty-four hours after the wound occurs, not only to promote blood circulation, for pain and discomfort in the abdomen, or cold, you can also use the hot compress to relieve. Whether you take hot compresses, or cold compress measures, do not ice bags or hot water bags, directly outside the contact area, you need to wrap up with a towel and then external compresses.