The sprain leads to rupture of small local blood vessels, significant bleeding, bruising and swelling, and the formation of a sterile inflammatory lesion at the site of the injury after the sprain. The gradual exudation of inflammatory exudate will aggravate the surrounding swelling and edema, leading to further aggravation of pain. Therefore, by using cold compresses to induce constriction of the small blood vessels, the bleeding can be effectively controlled and the swelling and inflammatory edema can be prevented from increasing. If the bruising and swelling formed after the swelling, it generally takes a longer time, which can lead to delayed healing time, the correct approach should be to cold compress after the sprain, about 5-10 minutes of cold compress can play a very obvious effect, and then brake rest, after 48 hours, the small blood vessel rupture place gradually closed, and then use hot water bags for hot compress, can increase Blood circulation, promote the absorption of inflammatory metabolites, and help the recovery of the injury.