The depression on both sides of the buttocks belongs to the connection part of the hip joint and femur, and the pain in this part may be caused by physiological reasons such as long-term strain, incorrect posture, and pathological reasons such as lumbar intervertebral disc herniation and femoral head necrosis. 1. Physiological reasons: there are muscle tissues such as gluteus medius and gluteus minimus attached to the depressed area on both sides of the buttocks, and prolonged strain may lead to aseptic inflammation of the myofascia, which produces metabolites such as lactic acid and stimulates the nerve root to cause pain; people who have been sitting for a long time and standing for a long period of time will have local myofascial tension and slow down the circulation, which will result in the appearance of the above mentioned symptoms. 2. Pathological causes: when the blood flow of the trophoblastic vessels of the femoral head is blocked due to various reasons, necrosis of the femoral head can be induced. After necrosis of the femoral head, there may be collapse of the femoral bone area, and the depressed part of the buttocks is more obvious, which is accompanied by pain; when the lumbar disease presses on the nerves, there may be bilateral pain in the depressed part of the buttocks, such as lumbar disc herniation, spinal stenosis, etc. If pain symptoms are not relieved or accompanied by pain symptoms, there may be pain symptoms. If the pain is not relieved, or accompanied by other symptoms, you should go to the hospital in a timely manner, to clarify the cause and give targeted treatment.