Tailbone pain refers to pain in the sacrococcygeal area, and both CT and MRI can be done when there is pain in the sacrococcygeal area, because the structures observed in the two tests are different, so there is no argument that one test is better than the other. 1. CT examination is mainly to check the condition of the human body’s bones, to check whether there is any bone fracture, hyperplasia and destruction, or to observe whether there is any calcification of the soft tissues. For sacrococcygeal pain caused by trauma such as falling on the buttocks, car accidents, or other traumatic injuries, CT examination can be considered if the possibility of fracture is high. 2. MRI mainly observes the changes of soft tissues. For sacrococcygeal pain caused by perianal abscess and other infections, tumor found in the sacrococcygeal area, hematoma in the vertebral canal after fracture, etc., MRI examination can be considered. Whether to do CT or MRI after sacrococcygeal pain, it is recommended to consult the doctor in time and let the doctor judge according to the specific situation.