There are several common reasons for pain in the hip bones after pregnancy: 1. caused by the relative lack of nutrition, when pregnant women not only have to provide their own nutrition, but also to provide nutrition for fetal development, early pregnant women will also have pregnancy reactions resulting in abnormal diet, which leads to lack of calcium ions, lack of trace elements, lack of vitamins, etc., in this case there will be bone pain in the weight-bearing part of the hip. 2, As the hormone level in the body of pregnant women changes after pregnancy, joints loosen, ligaments relax, the gap between bone and bone is gradually becoming larger and looser, the strength and robustness will decrease, and pain will occur in the hip of pregnant women who often sit or walk. 3. With the growth and development of the fetus the uterus gradually becomes larger, which increases the pressure in the pelvic cavity, and as a component of the pelvic cavity, the bones of the hip will also suffer from extrusion. When sitting for a long time, the load increases, resulting in minor damage to the hip bones and chronic strain injury, which leads to pain.