Clinical manifestations: Diffuse pain and numbness in the buttocks. In severe cases, it is difficult to sit up with the hands on the object, difficult to walk, and even requires strong analgesics to sleep. N-fossa pain may also be present. The gluteal epicutaneous nerve is a simple sensory nerve that originates from the posterior lateral branch of L1~3, emanates from the intervertebral foramen and passes through the fibrous foramen, travels along the back and above the ribs or transverse processes, then travels inward and outward in the sacrospinous muscle, crosses the sacrospinous muscle and travels through the deep fascia in the subcutaneous superficial fascial layer, and finally crosses the iliac crest into the buttocks. This anatomical feature allows the gluteal epiglottis nerve to be compressed when it is strained or deformed or narrowed by the flat circular fibrous canal formed by the sacrospinous muscle and the lumbar dorsal fascia at the superior edge of the iliac crest. Fresh autopsies have confirmed that the fibrous canal of the superior gluteal nerve is 2.0-3.5 cm long at the time of entry into the buttock, where the nerve trunk is more fixed and has the highest chance of entrapment. Causes: In the absence of external factors such as surgery or trauma, the onset of gluteal epiglottic nerve entrapment syndrome is due to repeated strain on the gluteal epiglottic nerve, resulting in nerve entrapment. This is supported by the fact that most clinical cases develop after greater physical activity such as climbing and playing soccer. In addition, the predominance of patients over 40 years of age may be related to the increase in subcutaneous fibrous and tendinous tissues and the decrease in tissue elasticity in the middle-aged and elderly, which may lead to easy compression of the gluteal epicutaneous nerve. Differential diagnosis: The disease lacks an objective basis for examination and can easily be misdiagnosed as lumbar disc herniation, lumbar small joint syndrome, lumbar sprain, muscle strain and myofasciitis. Diagnosis: In addition to diffuse pain and numbness in the hip, the following points should be made to establish the disease: (1) Normal muscle strength of the quadriceps of the affected limb. (1) Normal quadriceps muscle strength in the affected limb. A few patients with prolonged disease may have mild atrophy of the quadriceps muscle, but EMG shows normal; (2) Increased symptoms with bending, walking and sitting up; (3) Normal knee tendon reflexes; (4) Positive tinel’s sign below the midpoint of the line between the anterior superior iliac spine and posterior superior iliac spine; (5) Pain disappears after 10 ml of 1% lidocaine is applied to the positive sign. The positive tinel’s sign and the lidocaine closure test are the keys to establish the disease. The diagnosis of epiglottic nerve entrapment sign is mainly based on symptoms and signs.