Hidden pain in the hip bone of one side in early pregnancy may be caused by hormone level disorders in the body, joints without warmth, ligament pulling, localized fracture and other reasons. 1. Early pregnancy hormone level disorders in the body, the formation of water and sodium retention in the joints, causing synovial edema, one side of the hip bone will have hidden pain symptoms. 2. In early pregnancy, the body does not pay attention to keep warm, and cold wind invades the joints, such as hip joints and knee joints, which will show the phenomenon of hidden pain in one side of the hip bone after being eroded by cold wind. 3. In early pregnancy, as the uterus grows, the round ligaments are pulled, and congestion and edema occur after repeated pulling, which will show the symptom of hidden pain in the hip bone on one side. 4. Early pregnancy hip bone by gravity collision or accidental fall, may cause localized fracture, after the fracture will show the symptoms of hidden pain on one side of the hip bone. There may be other causes of hip bone pain in early pregnancy, it is recommended to go to the hospital in time, improve the relevant examination, under the guidance of professional doctors to actively diagnose and treat.