Urine occult blood +- indicates suspicious microscopic hematuria, suggesting that there may be physiological factors such as (strenuous exercise), urinary tract infection, kidney disease and other conditions. 1. Physiological: positive urinary occult blood can be seen in physiological situations, such as heavy exercise, menstruation and so on. 2. Urinary tract infections can also be suspected of hematuria, if there is a suspicion of infection, you need to do further tests to find out the infection germs for further treatment. 3. Some patients with kidney disease, such as acute nephritis, chronic nephritis, hypertensive nephropathy, etc., may also have occult blood. There are many other causes of urinary occult blood, such as urinary stones, urinary tumors, coagulopathies (idiopathic or pharmacological thrombocytopenia) and so on. Urine occult blood +-, need to actively regular hospital consultation, clear causes for targeted treatment.