The common causes of thigh root pain behind the hip may be the following: First, elderly patients due to osteoporosis, inadvertent fall can cause fracture of the femoral head, and thigh root pain symptoms. At this time, the patient can improve the local X-ray or CT examination, to clarify the severity of bone fracture, if necessary, as soon as possible to perform hip replacement, to restore the continuity of the thigh root bone, can be effective in relieving pain symptoms. Second, often fitness and physical exercise patients, due to prolonged exercise, can cause muscle strain in the thigh root behind the buttocks, causing pain symptoms. At this time, you can use local ice packs to reduce tissue exudation. 24 hours later, you can use hot omelette, blood circulation and blood stasis cream to promote the absorption of local inflammation, patients with mild symptoms 3-5 days after the pain symptoms can be completely relieved.