Compression of the left renal vein, clinically known as Nutcracker syndrome, is a compression of the renal vein by the angle between the abdominal aorta and mesenteric artery, or by the angle between the abdominal aorta and the spine. It is commonly seen in thinner adolescents. Treatment: 1. If there are no obvious symptoms of back pain and only slight hematuria and proteinuria, you can wait for the body to develop and observe whether the compression is relieved. If the lateral branch circulation is established, or the compression is reduced by the growth of surrounding connective tissue, and the patient can reduce the amount of exercise appropriately and observe the situation of hematuria and proteinuria. 2. If there is obvious hematuria, severe lumbar pain, renal function impairment, varicocele and semen abnormality, then surgery is recommended. Surgery can choose interventional stenting treatment, open surgery, reanastomosis of veins or autologous kidney transplantation and other methods.