One month after the ankle sprain is still swollen and painful, you need to improve the X-ray examination to exclude fracture, if there is a fracture need to reset and fixation, if it is a soft tissue injury, you can take the elevation of the affected limb, oral medication, plaster fixation and other ways of treatment. 1. Fracture: if the sprain is more serious, there may be tibia, fibula, talus fracture, you can improve the X-ray examination, clear fracture generally need surgery to restore internal fixation treatment. 2. Soft tissue injuries: If you exclude fractures, mostly soft tissue injuries, you can sleep on the affected side of the limb under a pillow, appropriate elevation of the affected limb is conducive to the lower limb blood return, and promote the ankle joint swelling. Oral steroidal anti-inflammatory drugs, such as diclofenac sodium extended-release tablets for anti-inflammatory pain and plaster fixation of the ankle joint, is conducive to the recovery of soft tissue injuries. Ankle sprain one month after the swelling and pain does not get better, it is recommended to consult a doctor in a timely manner, improve the relevant examination, under the guidance of the doctor for treatment.