Causes of coccygeal soreness include pregnancy, long-term chronic strain, trauma, cysts in the sacral canal and so on. 1. Pregnancy: seen in the late stage of pregnancy, due to the rapid growth of the fetus caused by pelvic compression resulting in coccygeal soreness, can be relieved through appropriate activities, change posture and other ways. 2. Long-term chronic strain injury: common in sedentary or standing for a long time, keep an incorrect sitting or standing posture for a long time, resulting in peripheral local inflammation, coccygeal soreness and distension of the coccyx. It can be relieved by resting, changing posture and applying hot compresses. 3. Trauma: Chronic pain can be formed after dislocation or fracture of the coccyx due to collision, sports, traffic accidents and other reasons. 4. Cysts in the sacral canal: cysts in the sacral canal will stimulate the cauda equina nerve and cause coccygeal pain. There may be other reasons for coccygeal pain, so it is recommended to go to the hospital in time, improve the examination to clarify the cause of the disease, and then give targeted treatment or therapy.