A positive urine test for occult blood suggests the presence of red blood cells, hemoglobin or myoglobin in the urine. Normal urine test for occult blood is negative, there are no red blood cells or hemoglobin in the urine, once the occult blood is positive, it may be due to physiological reasons or pathological reasons. Physiological causes are more common in fever, strenuous exercise and other causes of transient elevation. Pathological causes are more common in urinary tract infections, stones, tumors, tuberculosis, acute and chronic nephritis. In addition to the systemic coagulation dysfunction can also lead to positive occult blood, part of the young body tall and thin patients due to the left renal vein pressure, can also appear positive occult blood. Patients with positive urinary occult blood are advised to go to regular hospitals in a timely manner, follow the doctor’s instructions to complete the relevant examinations, and carry out standardized treatment under the guidance of the physician.