There are three main reasons for pain in the tailbone of pregnant women: 1. It is possible that the bursa at the tip of the tailbone has become inflamed due to the long sitting time of pregnant women. It is usually due to sitting for a long time and the continuous external pressure stimulation leads to the gradual appearance of serious lesions. The lesion stimulates the peripheral nerves and causes pain. The pain is especially pronounced when the foci are squeezed in a sitting position. 2, may be inflammation of the fascia near the tailbone, such as previous trauma to the tailbone, prone to the formation of chronic fasciitis in the position of the tailbone. The pain can also be caused by the inflammation of the tethered area due to fatigue, cold, and prolonged sitting. 3, the soft tissues of the lumbar region, muscles, tendons, ligaments, and fascia due to excessive fatigue and local strain gradually form inflammatory lesions after pregnancy.