Post-pregnancy buttock pain may be caused by post-pregnancy hormonal changes, sciatic nerve compression, osteoporosis and other reasons. 1. Hormonal changes after pregnancy: after pregnancy, estrogen and progesterone fluctuate in a woman’s body, and in order to adapt to transvaginal delivery, various pelvic ligaments relax, and these changes can cause pelvic pain of different degrees. 2. Sciatic nerve compression: with the increasing pregnancy weeks, after the fetal head enters the pelvis, there may be different degrees of mechanical compression of the sciatic nerve, which may cause pain in the buttocks, thighs, calves and even the instep. 3. Osteoporosis: after the 14th week of pregnancy, calcium supplements should be routinely taken, and a high-calcium diet, such as untimely supplementation or insufficient supplementation dose, can cause a large amount of bone calcium loss in pregnant women, resulting in buttock pain. Pain in the buttocks during pregnancy is a common symptom during pregnancy, which can be relieved by adjusting the sleeping position, lying on the left side as much as possible, avoiding prolonged standing and sitting, exercising in moderation, and supplementing calcium in a timely manner and in sufficient quantities, etc. If the pain is obvious and intolerable, the patient should consult the hospital in a timely manner.