The tailbone is located at the most caudal end of the spine, lying down and sleeping with painful tailbone pinching may belong to the normal situation, or may be caused by chronic strain injury or tailbone disease, etc. The patient should let the doctor make a comprehensive judgment based on the relevant symptoms and examination results. 1, normal condition: if the bed is too hard for sleeping, some thinner patients have more prominent bones in the tailbone area, which are easily compressed while sleeping, thus causing ischemia of the tailbone ligaments and fascia, resulting in ischemic pain; 2, chronic strain injury: due to sedentary, trauma and other reasons, the patient’s tailbone area is subjected to prolonged Due to prolonged pressure and friction, the local ligaments and fascia are chronically damaged. When sleeping at night, due to the pressure stimulation of the bed, the patient’s symptoms flare up and pain and discomfort occur; 3, tailbone diseases: such as fractures, dislocations, ligament injuries, tumors, etc., which can cause pain and swelling, or fracture dislocation is not well reset afterwards, the tailbone area is deformed and healed, leaving chronic ischemic pain, and the pain flares up during sleep due to friction, cold, etc. When sleeping flat, if the tailbone pain, patients should pay attention to the occurrence of disease, you can go to the hospital to perform local X-ray, magnetic resonance imaging and other related examinations, and then targeted treatment.