Swelling of the foot after being hit by a car is common in the following cases: 1) fracture; 2) soft tissue injury, such as muscle, tendon or ligament damage. After the swelling, it is best to go to the emergency department or orthopedic department of the hospital to take pictures to exclude whether there is a fracture, and if there is no fracture, it is also best not to walk with weight immediately to avoid swelling. It is recommended to apply brakes for 3-4 weeks in severe cases with a cast or brace, and in mild cases with an elastic bandage to apply appropriate pressure. During the braking period, use a pillow to elevate the foot to help the swelling subside, and it is best to take ice, local ice can eliminate inflammation and swelling to promote the repair of soft tissue, generally 30 minutes / time, 4-6 times / day. If the swelling and pain subsides after 2 weeks, patients with no fracture and mild soft tissue damage can try to walk on the ground with crutches. If the swelling and pain are still obvious after 2 weeks, it means that the soft tissues are not yet in place, so it is necessary to continue to extend the time of cast or brace fixation by 1-2 weeks, and it is better to recheck with the doctor to determine the next treatment plan.