Swollen feet after injury is cold or hot compresses need to be based on the time after the injury, generally speaking, the injury within 72 hours of cold compresses, 72 hours after the hot compresses. Swollen feet after injury early that is, within 72 hours of cold compresses, the main role is to promote subcutaneous vasoconstriction, reduce subcutaneous hemorrhage, edema and oozing, relieve pain. Hot compresses are recommended in the middle and late stages of a swollen foot injury, i.e., after 72 hours, to promote local blood circulation, promote the absorption of bruises and edema, and promote healing. Swollen feet after injury not only need cold compresses and hot compresses, it is recommended that the patient consult a doctor in a timely manner, improve the relevant examination, to clarify the degree of injury and whether there is osteoarthritic injury, if necessary, medication, surgery and other treatments.