Urine routine urine occult blood +- is not normal, may be caused by physiological reasons, may be caused by pathological reasons, and may be caused by test error. Normal human urine routine urine occult blood should be negative. A weak positive urine occult blood may be a false positive caused by a test error, or it may be caused by physiological or pathological reasons. Common physiological reasons are fever, strenuous exercise, etc., at this time no special treatment, with the improvement of the physical state, occult blood will generally disappear on their own. Pathological causes are more common in urinary tract infections, stones, tumors, tuberculosis, various acute and chronic nephritis. Once the urine occult blood weak positive, need to timely regular hospital consultation, in the avoidance of fever, strenuous exercise, again review urine routine, if necessary, urinary ultrasound, urine erythrocyte morphology and other related examinations, clear causes for targeted treatment.