Urine occult blood 3 + represents urine occult blood test is strongly positive, urine may appear more red blood cells, the emergence of urine occult blood has physiological and pathological reasons. Physiological factors are generally not serious, pathological causes such as urinary stones, urinary tract infections, urinary tract tumors and glomerular diseases, etc., the severity of which should be assessed according to the condition, and cannot be generalized. 1. Physiological reasons: more common in strenuous exercise, women’s menstrual period, menstrual blood mixed into the urine, there will be a positive urinary occult blood, after resting can return to normal, not serious. 2. urinary stones: for example, ureteral stones, kidney stones and bladder stones, etc., the patient will have naked eye visible hematuria performance, through the treatment of stone removal, most can be restored, so relatively speaking is not very serious. 3. Urinary system infection: patients will have urinary urgency, urinary frequency and urinary pain and other symptoms, may also cause urinary occult blood positive reaction, through the treatment of most of the recovery, so it is not serious. 4. Tumor of urinary system: this situation is relatively more serious, especially the malignant tumor of urinary system, such as bladder cancer, kidney cancer, etc., which is more difficult to treat. 5. Glomerular diseases: for example, acute or chronic nephritis, purpura nephritis and lupus nephritis, etc., causing urinary occult blood 3+ is relatively serious. It is recommended that patients actively improve the relevant examination, under the guidance of professional doctors, to give the corresponding treatment, so as to avoid further development of the condition.