There are many causes of pain in the lateral thigh bone, but the most common is caused by the following conditions: First, if the local trauma, causing periosteal injury, local fracture, it will cause pain symptoms in the lateral thigh bone. Second, if there is osteoarthritis of the hip joint, or femoral head necrosis, it will also cause pain in the lateral thigh bone. In the early stage, it is necessary to carry out an MRI of the hip joint to make a clear diagnosis. Third, if there are bone cysts or bone tumors, it will also cause painful symptoms in the lateral thigh bone. It is necessary to actively take a film or MRI, especially for some malignant bone tumors, which need to be actively treated by surgery.