Cold compresses should be applied immediately after a minor muscle strain or a small amount of fibrous rupture, and should be applied with an ice water mixture, or if time is not available, with ice or sorbet. If cold compresses are not applied, many patients will develop large areas of ecchymosis, bruising, and swelling. After the cold compress, vascular bleeding is reduced, exudation is reduced, swelling will be reduced, and the later stage will be better recovery, so cold compress must be applied as follows: 1. Cold compress time: cold compress is usually applied within 24-48 hours, and different treatment periods are taken according to different conditions. If the swelling is particularly obvious, when the damage is very serious, this time to timely cold compress, cold compress time is best within 48 hours. However, if the injury is mild, such as a sprain of the ankle joint, a cold compress for 24 hours is usually sufficient at this time. So according to different situations, cold compresses also need to take different time periods; 2, cold compress selection: cold compress is generally best to use ice water mixture, so that it covers a larger area, all swollen parts can be covered. If the cold compress is simply ice, it covers a relatively small area and cannot cover all the swollen areas. If cold compress is not applied, local muscle tearing will result in small blood vessel tearing, which will lead to local bleeding, edema, and later exudation, and even formation of hematoma, which, if mechanized, may become infected and is not conducive to the patient’s later recovery. Therefore, cold compresses are necessary, and patients should pay attention to the time of cold compresses and the way of cold compresses. If there is significant damage to the affected area, it may need to be fixed and sometimes even surgical treatment is required.