Wake up in the middle of the night with pain on the outside of the left crotch and sweating, consider lumbar disc herniation, femoral head necrosis, sports injuries and other factors. 1. Lumbar disc herniation: after various parts of lumbar vertebrae have different degrees of degenerative changes, the annulus fibrosus ruptures and the nucleus pulposus protrudes under the action of external force, which will compress the nerves and lead to pain in the crotch. 2. Necrosis of the femoral head: because of ischemic necrosis of the femoral head, it will cause pain in the hip or groin, which can be radiated to the hip bone on the same side, causing pain in the hip. 3. Sports injuries: in the process of sports, if blind sports cause muscle injury, will also induce disease and jeopardize the health, the emergence of hip pain, must be scientific sports. Lateral hip pain is mainly related to these factors, it is recommended to reduce local activities, pay attention to rest, such as the situation can not be improved, it is recommended to go to the regular hospital for a detailed examination, to clarify the cause of the disease and then treatment.