Thigh pain in the elderly can be caused by the following reasons: first, hip impingement syndrome, when the elderly have joint degeneration, the occurrence of joint spurs, it can lead to the acetabulum and femoral neck impact, resulting in the tearing of the glenoid lip between them, so that the symptoms of thigh root pain, then we should check the X-ray and MRI of the hip joint for early diagnosis and treatment. Second, femoral head disease, when the femoral head has aseptic necrosis can also have thigh root pain, especially when walking and hip joint weight bearing pain is very obvious, then we should check the MRI and CT of the femoral head for diagnosis and early treatment. Third, tumor, when there is a tumor in the hip joint or soft tissue, there can also be symptoms of thigh root pain, then it is necessary to check the MRI of the hip joint for diagnosis and early treatment.