Hip pain in the thigh can have the following causes: first, femoral head necrosis, when the femoral head has aseptic ischemic necrosis, there can be pain in the hip joint, which can radiate to the inner side of the thigh, the front side or the front side of the knee joint, especially when walking and weight-bearing on the hip joint, the pain is very obvious, at this time, we should check the X-ray and MRI of the hip joint early to diagnose and treat. Second, the hip joint impingement syndrome, when the acetabulum of the hip joint impinges on the neck of the femur, or when the small ridge of the hip joint impinges on the sciatic bone, there can be pain on the inner and anterior side of the thigh, and at the same time, there can be pain in the hip joint, especially when walking and when the hip joint is flexed, the pain is very obvious, then the MRI of the hip joint and the X-ray of the hip joint should be checked at an early stage for early diagnosis and treatment.