The possible reasons for the pain after three years of tailbone fracture include bone non-union, soft tissue adhesion, osteomyelitis and so on. 1. Bone non-union: if the patient’s tailbone fracture end, there are abnormal stress or repeated times of rough reset, etc., it is easy to cause the patient’s tailbone fracture non-union, usually need to be operated again for reset. 2. Soft tissue adhesion: If the patient does not have sufficient rehabilitation training after the tailbone fracture, long time braking will easily form soft tissue adhesion, and even if the tailbone fracture is three years old, pain may occur. 3. Osteomyelitis: If the patient has a bacterial infection after the tailbone fracture, and does not get timely treatment, the formation of chronic osteomyelitis, there will be localized pain in the tailbone, and may be accompanied by local redness and swelling. Caused by tailbone fracture three years also pain causes more, if the patient pain symptoms recur, it is recommended to promptly go to the hospital to identify the cause of the disease, targeted treatment.