Swollen feet hot or ice packs generally need to be based on the time of injury, if within 72 hours of ice can reduce swelling and pain, after 72 hours of heat can be used to promote blood circulation to relieve symptoms. 1. Ice: Ice can shrink blood vessels, reduce the oozing of the surrounding tissues and blood seepage, thereby reducing local swelling; can inhibit the metabolism of the injury site, thereby reducing the inflammatory response; reduce or slow down the release of histamine, reduce the sensitivity of the tissues to pain. After achieving the reduction of swelling and blood seepage, ice packs should be stopped, avoid prolonged ice packs. 2. Hot compresses: hot compresses will make blood vessels dilate to promote blood circulation, which is conducive to the repair of damaged tissues; it can also help relieve muscle tension and reduce pain. After the injury, the affected area may have blood vessel damage, blood seepage, hot compresses will aggravate the symptoms, hot compresses are not recommended at this time. Swollen feet are recommended to go to the hospital in time to check the injury, whether there is ligament damage and fracture, etc., and under the guidance of the doctor for treatment.