The most common causes of thigh root pain: First, after a long period of walking or strenuous exercise hip ligament inflammation, muscle strain, local inflammatory reaction will appear pain, pain is mainly manifested as soreness, swelling, sometimes may be combined with a tingling sensation, pain aggravated by activity, bed rest pain can be significantly relieved. Generally, the pain area is concentrated in the groin area or the inner thigh, and the pain range is relatively wide, without painful points. Second, the lesion of the femoral head itself, such as femoral head necrosis, local edema and inflammatory reaction, which leads to local pain and restricted activities, and the abduction and external rotation of the hip joint will be significantly restricted, and the pain will be aggravated when standing and walking or bearing weight, and can be relieved when resting in bed.