The foot sprain generally takes cold and hot compresses, but the time of cold and hot compresses have requirements, early injury within 24-48 hours, local bleeding, edema, through cold compresses can reduce tissue exudation, reduce vasodilation, thereby reducing bleeding and edema, which is beneficial. 24-48 hours later, if the cold compresses, will slow down the local blood circulation, is not conducive to tissue recovery, when the bleeding basically This is when the bleeding basically stops. To be on the safe side, you can apply hot compresses after another day, i.e. three days. Hot compresses can promote local blood circulation, so that the original bleeding and edema can be absorbed quickly, thus promoting the recovery of the body, which has certain benefits.