Urine occult blood is one of the routine urine tests and is classified as negative or positive. Negative means normal and does not need to be treated. A positive result indicates the presence of hematuria, which can be caused by a variety of reasons, such as physiological factors commonly occurring after prolonged standing, exertion, staying up late, heavy physical activity, and strenuous exercise, etc., when red blood cells break down and hematuria occurs. There are also positive results of urine occult blood in women during menstruation due to blood contamination of urine, and these cases usually do not require special treatment. In addition, it may also be due to pathological factors, clinically positive urine occult blood is usually seen in the urinary tract inflammation, stones, tuberculosis, tumors, or immune system and blood system diseases, etc., should seek medical examination and treatment. 1, urinary tract inflammation: such as pyelonephritis, cystitis, etc., to cystitis, for example, inflammation stimulates mucosal epithelial congestion, edema, broken bleeding, there will be hematuria, lumbar pain, urinary frequency, urinary urgency, urinary pain and other symptoms 2, urinary stones: such as bladder stones, kidney stones, urethral stones, etc. Take urethral stones as an example, stones may cause mucosal damage and bleeding, which may lead to positive urine occult blood, accompanied by urinary pain, dribbling urination, difficult urination and other symptoms. The diagnosis can be confirmed by Mycobacterium tuberculosis examination, tuberculin test and CT; 4. Immune system diseases: such as systemic lupus erythematosus will have symptoms such as hematuria, elevated blood pressure, pteroidal erythema and arthralgia, and the diagnosis can be confirmed by examining blood routine and autoantibodies; 6. The dosage should be reduced or stopped appropriately according to medical advice. As well as large burns, extracorporeal circulation, post-operative heart valve repair, severe muscle trauma and vascular tissue injury, exogenous toxins, etc. can lead to massive destruction of red blood cells, which can also lead to hematuria, resulting in positive urine occult blood, and should be clearly diagnosed by a doctor for targeted treatment.