Whether the tailbone has a fracture can be determined by the following aspects: 1. whether there is a clear history of trauma, such as a sudden fall, landing on the buttocks, especially when the tailbone lands on the ground, which may cause a fracture. 2. the degree of pain, such as turning over, sneezing or slight movements, can cause pain, and the possibility of fracture is also higher at this time. 3. if there is an obvious bone rubbing sound, bone rubbing sensation. This is the time when the fracture can be determined. In addition, the best way is through imaging, such as X-rays, CT, MRI. x-ray may find no fracture, if the fall is serious, CT scan can be performed, CT can find subtle fractures. In addition, MRI can determine whether the fracture is fresh or old. By combining the above aspects, it can be clear whether there is a fracture of the tailbone.