The report of urinary occult blood a plus and a minus, indicating the existence of urinary occult blood weak positive, may be physiological conditions, such as strenuous exercise, late at night, etc., may also be pathologic factors, such as glomerulonephritis, urinary infections, urinary stones, urinary tumors, etc. caused by. 1. Physiological conditions: such as strenuous exercise, late at night, nervousness, nutcracker syndrome, etc., may lead to urinary occult blood weak positive, at this time there is no need for special treatment, pay attention to rest, regular review can be. 2. Pathological factors (1) glomerulonephritis: can be manifested as edema, urinary occult blood weak positive, foamy urine, etc., this time need to comply with the doctor’s instructions to improve the renal ultrasound, urinary protein quantitative and other tests. (2) Urinary infections: For example, pyelonephritis, cystitis, urethritis and other infections of the urinary system, which cause local damage and hemorrhage, and also lead to weakly positive urinary occult blood, which is usually accompanied by pain in urination, urinary frequency, urinary urgency and other symptoms. (3) urinary stones: for example, ureteral stones, kidney stones, etc., may cause local damage, which will cause urinary occult blood weak positive, usually accompanied by severe pain in the lower back and abdomen, and even the appearance of hematuria. (4) Urological tumors: for example, bladder tumors, kidney tumors, etc., in the early stage will appear in the urine occult blood weak positive, with the aggravation of the lesion, may also cause painless hematuria, and the duration of a long time. Weakly positive urinary occult blood is recommended to go to the regular hospital in time to do further examination, to clarify the specific causes of the disease, and timely compliance with the doctor’s instructions for treatment.