Ankle fracture mostly refers to ankle joint fracture, ankle fracture cast 30 days still pain may be due to the fracture has not yet healed, soft tissue adhesion, fracture displacement and so on. 1. Fracture has not yet healed: because the fracture belongs to the heavier injury, 3 months to 6 months after the fracture is in the primitive scab formation period, the fracture is still in the healing stage, at this time there is pain, which is a normal phenomenon. 2. Soft tissue adhesion: because ankle fracture requires external fixation with plaster, long time braking of the lower limb will cause soft tissue adhesion around the ankle joint such as muscles and tendons, and ankle joint pain will also occur. 3. Fracture displacement: if the fracture goes down to the ground too soon after the fracture, because the fracture has not yet healed, the fracture end is displaced under the action of external force, and the broken end of the fracture stimulates the surrounding soft tissues, which will also cause ankle joint pain. There are many reasons for pain 30 days after cast external fixation of ankle fracture, and it may also be related to thrombosis, excessive activity, etc. If the symptoms continue to be unrelieved, it is recommended to consult a doctor in time to clarify the cause of the disease and carry out targeted treatment.