In general, soft tissue injury, before 24 hours it is recommended to ice, ice time of about 3 minutes / time, rest for a period of time and then ice, so that the repeated cycle, you can relieve soft tissue injury, edema and bleeding bruises. The purpose of cold compresses is to make the swollen blood vessels contract, while the purpose of hot compresses is to allow the blood vessels to re-expand, increase blood flow, and prevent tissue necrosis, so you can not ice for a long time. After 24 hours, hot compresses should be applied. The treatment method of ice compresses is different for different conditions and diseases, generally according to the doctor’s recommendation, and should not be applied for a long time, because prolonged ice compresses will cause local tissue ischemic effect, which will cause the oxygen supply and nutrient delivery to be affected and cause local tissue necrosis. Therefore, ice should be applied according to the doctor’s instruction.