How to choose the treatment method and treatment duration of ice and heat packs after acute sports injury, there are many different versions on the Internet, but most of them are ice packs in the first 24/48/72 hours after the injury, and after that, the sequential treatment is changed to heat packs. 1, ice packs The principle of ice packs lies in: in the acute inflammatory period after soft tissue injury, through the contraction of blood vessels to reduce the formation of edema, reduce the metabolic rate of damaged tissue to reduce the secondary damage of oxygen free radicals. At the same time, the skin is lowered to below 15 ° C can reduce the conduction speed of the pain nerve to play a similar effect of local anesthesia. In the subacute inflammatory response also play a similar anesthetic effect. The specific practice of ice: 1, site: pain or swelling occurs in the area. 2, material: ice and water mixture is best (to ensure that the ice material is 0 ° C), but the outside should be covered with a towel, so as not to direct contact with the skin, resulting in frostbite. 3, time: generally 10 minutes each time. (A large number of experimental animal studies and human studies have proved that intermittent ice packs for 10 minutes can effectively reduce the tissue temperature; this application can directly reduce the skin temperature to below 5 ° C) 4, Frequency: every 10 minutes, three times a day. 5, Duration: the guidelines of the Dutch Health Institute advocate application within the first 4-5 days of injury [3]; while there is also literature that mentions use within a week of injury. 2, hot compresses Domestic doctors have emphasized hot compresses after cold compresses, the principle lies in: in soft tissue injuries after the initial acute inflammatory period, can enhance blood circulation, relax the muscles, so that the accumulation of lactic acid or inflammatory mediators in the injured muscles to accelerate the metabolism and reduce pain. However, doctors are basically based on their own understanding of sports injuries and clinical experience, and some suggest starting after 24 hours after injury, while others suggest starting after 48 hours. However, the author’s review of the foreign literature did not find the application of hot packs in sports injuries, and therefore evidence of evidence-based medicine is not available. To summarize, in the early stage of sports injury (at least within 4-5 days), intermittent application of ice packs has clear evidence of evidence-based medicine and can be used in accordance with the principle; whereas hot packs as a sequential treatment afterward are mostly the clinical experience and advocacy of domestic doctors, and their application should be treated with caution, and it is expected that there will be relevant studies that can provide clear clinical evidence.