It usually takes 2-6 weeks to reduce the swelling of a broken foot, the details are as follows: First, mild foot sprain: only soft tissue contusion, the swelling is not serious, after cold compressing and braking, the swelling can usually be completely subsided in about two weeks, which will not affect normal life. Second, serious ankle sprain: If it is a serious ankle sprain, even with a fracture, it needs to be fixed, and the patient’s swelling can usually subside in about six weeks, and it needs to be accompanied by rehabilitation training, elevation of the affected limb, and local continuous auxiliary treatment. After the swelling subsides, it is also necessary to move the joint, enhance the strength and intensity of the muscles around the joint and stabilize the joint in order to make the symptoms disappear completely, otherwise the swelling will recur and affect the patient’s normal life and work. In conclusion, attention should also be paid to protecting the ankle joint in normal life, especially when going down stairs, when ankle sprains are most likely to occur.