When a patient suffers from lumbar muscle strain, lumbar disc herniation, femoral head necrosis and other diseases, it may lead to low back pain, which may cause groin pain. 1. Lumbar muscle strain: it is usually a chronic injurious inflammatory lesion caused by chronic strain, small joint dysfunction, fracture injury and other factors. If the patient’s strain site is large, it may cause groin pain. 2. Lumbar intervertebral disc herniation: mainly due to lumbar degeneration, long-term physical labor and other factors, resulting in intervertebral disc fibrous ring rupture, so that the nucleus pulposus protrudes from the rupture place in the spinal canal. When it presses the peripheral nerves, it may lead to groin pain. 3. Necrosis of the femoral head: a disease usually caused by ischemia of the femoral head due to long-term alcoholism, hormone use, trauma and other factors. The occurrence of femoral head necrosis will lead to poor local blood circulation, or involved in the surrounding caused by pain, thus appearing to make the patient appear groin pain phenomenon. When the patient has groin pain, it may also be related to other factors, it is recommended to go to the hospital for examination in time, and under the guidance of the doctor with the relevant examination to determine.