Leg pain and lumbar pain and hip pain may be caused by osteoporosis, internal hip joint lesions, trauma, lumbar disc herniation and so on. 1. Osteoporosis: when suffering from osteoporosis, often in some cancellous bone distribution is more, and involves weight-bearing parts, easy to appear bone pain. 2. Hip joint internal lesions: If the patient has osteoarthritis of the hip joint, it may cause degeneration of the lumbar spine and other joints of the lower limbs, which may cause leg pain, waist pain and hip pain. 3. Trauma: local external forces, such as car accidents, fall from a height, etc., will cause soft tissue congestion, edema, and even cause the continuity or integrity of the bone is interrupted, and the local hemorrhage, hematoma can be formed, and compression, stimulation of the peripheral nerves, which will lead to lumbar pain, crotch pain, leg pain and other symptoms. 4. Lumbar intervertebral disc herniation: due to injury, disc herniation, degeneration and other reasons, the lumbar intervertebral disc protrudes outward, which can compress the nerve root. The compression of spinal nerve roots will cause spinal nerve congestion and edema, which will lead to lumbar pain, crotch pain and leg pain. If there is a long-term leg pain lumbar pain crotch pain, it is recommended to consult a doctor in time, by the doctor to clarify the cause of the disease, and then give targeted treatment.