The pain on both sides of the hip bone of pregnant women may be caused by the enlargement of the fetus or lack of calcium, etc. Different causes choose different treatments, as follows: 1. Fetal enlargement: it may be due to the increasing size of the fetus in the uterine cavity, causing the uterus to increase in size and oppress the hip bones on both sides, thus causing pain on both sides of the hip bones, which can be relieved by applying hot compresses. 2. Calcium deficiency: it may be caused by unbalanced nutrition during pregnancy, resulting in calcium loss and osteoporosis, which can lead to pain on both sides of the hip bone, accompanied by leg pain or leg cramps, etc. Calcium gluconate oral solution or calcium carbonate and other medicines can be taken to relieve the pain, and please use the medication under the guidance of a doctor. It is recommended to pay attention to diet and balanced nutrition during pregnancy. Pay attention to keep warm, add clothes in time according to the weather conditions, and take maternity checkups on time. If the situation is serious, consult a doctor at the hospital immediately.