Pain in the lateral aspect of the hip is considered to be related to necrosis of the femoral head, lumbar spine disease, trauma, synovitis and other causes. 1. Necrosis of the femoral head: This refers to the interruption of blood supply to the femoral head, causing necrosis of bone cells and bone marrow components and subsequent repair, leading to structural changes in the femoral head, and ultimately causing the femoral head to collapse, which leads to pain in the lateral aspect of the thigh. 2. Lumbar spine diseases, such as lumbar disc herniation, lumbar spinal stenosis, etc. These lesions will cause compression of the nerve roots, causing radiating pain in the buttocks and lower limbs, which will also cause pain in the lateral aspect of the hips. 3. Trauma: such as soft tissue injuries on the outside of the hips, hip fractures, etc., can also cause lateral pain in the hips. 4. Synovitis: synovitis is caused by joint degeneration, trauma and infection. These factors can cause damage and inflammation of the synovial membrane, which can cause lateral hip pain. There are many causes of lateral pain, if the pain is serious or can not be relieved, you should go to the hospital in time to further identify the cause of the disease, and then targeted treatment.