Usually when a foot is broken and swollen, if there is only slight local redness, swelling, heat and pain, it can usually heal on its own. If there is severe pain and obvious subcutaneous hematoma when the foot is broken and swollen, it usually cannot heal on its own and it is recommended to seek medical attention and examination before treatment. The swelling of a broken foot is due to local soft tissue injury, resulting in swelling caused by fluid accumulation in the surrounding tissues. This condition usually lasts for 2-3 days, and with the continuous absorption of tissue fluid, the swelling will gradually ease, and this condition can also heal on its own. In addition, interventions can be made by artificial means to promote swelling recovery and reduce pain. First of all, applying ice to promote the absorption of tissue fluid and speed up the swelling, and braking the affected side with appropriate bed rest and avoiding activities can also relieve the affected swelling. The choice of elevating the affected limb will facilitate venous return and prevent the swelling from increasing. In addition, you can also use some medications such as Yunnan Baiyao and Furtalin, which can effectively reduce local swelling. If the foot is broken and swollen with severe pain and obvious subcutaneous hematoma, you need to consult a doctor promptly to determine whether there is a ligament strain or fracture, and treat it promptly according to the situation. It is not recommended to move the affected area frequently during the recovery period, otherwise it will easily lead to habitual sprains and even develop into chronic muscle ligament injuries and other diseases.