If the body has back pain and crotch pain, it may be caused by sacroiliac arthritis, lumbar disc herniation, osteoporosis, femoral head necrosis and other factors. 1. Sacroiliac arthritis: prolonged use of glucocorticosteroids or maintaining a posture for a long time may lead to hyperplasia, edema and other proliferative reactions of the sacroiliac joints, which may cause pain in the lower back and crotch. 2. Lumbar disc herniation: when the nucleus pulposus of the lumbar disc protrudes to the side of the annulus fibrosus, it will compress the sciatic nerve around the spine, making the innervated area feel abnormal, which leads to lumbar pain and crotch pain. 3. Osteoporosis: Osteoporosis will cause the human body to lose a lot of calcium, so that the body’s calcium nutritional deficiencies, bone brittleness increases, which is easy to fracture during activities, resulting in back pain, hip pain phenomenon. 4. Necrosis of the femoral head: Necrosis of the femoral head affects the blood supply around the femoral head and causes changes in the pressure in the hip joint to stimulate the nerves around the hip joint, resulting in significant pain in the lumbar region and hips. If you have obvious symptoms of back pain and hip pain, we recommend that you go to the orthopedic department of the hospital as soon as possible for a systematic and comprehensive examination to clarify the cause of the disease.