If there is swelling around the ankle bone after a foot is broken, there may be several reasons: first, soft tissue injury, when the soft tissue is seriously injured, there can also be obvious swelling around the ankle bone, which can be accompanied by obvious pressure pain and joint activity limitation. Second, fracture, after a broken foot to shoot X-ray, if found to have a fracture can be accompanied by swelling around the ankle bone, which is the fracture of the outer ankle, because after the fracture there is often bleeding, which can lead to hematoma around the fracture of the ankle bone and lead to swelling. Third, ligament injury, if the ligament around the ankle bone has rupture, there can also be bleeding at the rupture site, which leads to swelling around the ankle bone, and then there can be obvious limitation of the ankle joint activities. Fourth, tendon injury, tendons can be ruptured or displaced, often leading to swelling around the ankle bone.