Diagnosis of pyriformis syndrome is based on the main clinical manifestations: pain in the buttocks radiating to the back or back side of the lower limb on the same side; pain can be increased by urination, defecation, coughing and sneezing. In addition, the diagnosis of pyriformis syndrome also needs the support of some tests: the affected side of the buttock tenderness is obvious, especially in the area of the pyriformis muscle, which may be accompanied by atrophy, palpation can touch the diffuse blunt thickness, become a strip or pear-shaped muscle bundles, local hardness. Straight leg raising before 60 ° pain is a positive test, because the pyriformis muscle is stretched to a state of tension, so that the damage of the pyriformis muscle on the sciatic nerve compression and stimulation of the more serious, so the pain is obvious. However, after 60°, the pyriformis muscle is no longer stretched and the pain is reduced. In addition, in addition to the straight leg raising test, the pear muscle tension test should be done. Usually, the pear muscle tension test is also positive in pyriformis syndrome.