Thigh root pain should consider the following factors: First, the problem of the hip joint, the thigh root refers to the location of the hip joint pain, to take a film to see if there is congenital acetabulum, dysplasia, aseptic necrosis of the femoral head, fractures around the hip joint, such as bone neck fracture, femoral intertrochanteric fracture can cause thigh root pain. Secondly, we should consider whether there are diseases of the lumbar spine, such as herniated discs and lumbar spondylolisthesis. Sometimes these diseases lead to nerve compression, which can cause pain in the innervation zone of the thigh root. Thirdly, we should consider diseases of vascular factors, such as thrombosis of the deep veins of the lower limbs of the vena cava, which affects the blood supply of the lower limbs and may cause pain in the thigh muscles over time. Fourth, then the thinking should be more open, we should consider the knee joint, because the knee joint and hip joint are mutually constrained joints, if the knee joint is out of order, the hip joint will be affected, after the hip joint is affected will also cause pain in the root of the thigh, so the root of the thigh pain should be considered from the nerve aspect of the joint, blood supply to consider the cause.