Nutcracker syndrome, or left renal vein compression syndrome, also known as nutcracker phenomenon, occurs in males from adolescence to about 40 years of age, with childhood onset distributed between 4 and 7 years of age, with the most frequent age seen at 13 to 16 years of age. The main symptoms of Nutcracker phenomenon are hematuria and proteinuria, of which asymptomatic carnal hematuria is more easily detected. The cause of hematuria is compression of the left renal vein resulting in renal venous hypertension, bruising of the periureteral and genital veins draining from the dilated left renal vein, abnormal traffic with the renal collecting system, or thinning and rupture of part of the vein wall, resulting in non-glomerular hematuria, and also bruising of the testicular and ovarian veins resulting in cribriform pain, which is aggravated by standing or walking. In addition, men can develop varicocele. In addition, there is proteinuria, irregular menstrual bleeding, and hypertension. The diagnostic criteria for this disease are: bleeding in one kidney; non-glomerular urine red blood cell pattern; normal urinary calcium excretion; cystoscopy with blood spraying or hematuria at the left ureteral orifice; and dilated left renal vein visible on abdominal ultrasound or CT examination. B-mode ultrasound is the preferred noninvasive and noninvasive test for the diagnosis of compression syndrome of the left renal vein. The diameter of the left renal vein on the left side of the aorta is more than 50% wider than that of the left renal vein directly in front of the aorta, i.e. the diameter of the dilated part of the left renal vein is more than twice the diameter of the stenosis can be diagnosed.