Tailbone pain in pregnant women may be caused by changes in hormone levels in the pregnant woman’s body, compression of the pelvis by the enlarged uterus, and perianal lesions. 1. Changes in hormone levels in pregnant women: due to changes in hormone levels in women’s bodies after pregnancy, estrogen and relaxin will make ligaments loose and joints loose, thus causing pain in the tailbone. 2. Uterine compression of the pelvis: due to the increase in the size of the uterus during pregnancy, there will be significant pressure on the structures and tissues in the pelvic cavity, including the pressure of the tailbone, resulting in tailbone pain. 3. Perianal lesions: If a pregnant woman has associated lesions in the perianal area, such as hemorrhoids, etc., the lesions will lead to the appearance of tailbone pain when they flare up. Tailbone pain after pregnancy is a normal phenomenon during fetal development. However, if the pain is intolerable, it is recommended to consult a doctor in time, under the guidance of the doctor, improve the relevant examination, clarify the cause of the disease, and symptomatic treatment.