In the middle and end of pregnancy, because the uterus enlarges more significantly, it may compress the nerve on one side and cause pain on one side of the buttock. The pain is usually more obvious when lying down, but disappears after getting up and moving around. To avoid sitting or standing for a long time and to pay attention to appropriate activities, this kind of buttock pain symptom occurs. If the pain is serious, you can also massage to relieve the pain and discomfort. In addition, in the middle and later stages of pregnancy, the demand for calcium increases greatly, and if pregnant women have symptoms of calcium deficiency, they may also have buttock pain. Pay attention to calcium supplementation to avoid bone pain caused by calcium deficiency. Pay attention to eating more calcium-rich foods, such as shrimp, tofu, black fungus and animal liver. This kind of buttock pain usually disappears automatically after the baby is delivered, so there is no need to be too anxious.