The causes of the swelling of ankle fracture in three months include blood circulation disorder, myofasciitis, etc. Functional exercise, foot soaking in hot water and ibuprofen and other medicines can be given to address the causes of the disease. 1. Blood circulation disorder: the swelling of ankle fracture will gradually subside in about 4 weeks, but the local blood circulation may not be fully restored, when walking, the blood supply in the ankle area increases, but the venous return is not good, the local swelling will occur, you can strengthen the functional exercise so that the venous return is gradually restored, and you can also soak your feet in hot water, elevate the fractured ankle to promote blood circulation. 2. Myofasciitis: when the ankle bone fracture injury may hurt the muscle fascia of the ankle, the myofascia at the inflammatory reaction, or originally have myofasciitis, may also appear ankle swelling, can be localized hot compresses, such as accompanied by pain can be added with ibuprofen and other analgesic treatment. The ankle fracture three months still swollen may have other causes, should be timely to the regular hospital, the doctor according to the condition of the specific cause of the disease, for the cause of the correct treatment.