Male urine routine examination of urine occult blood positive, consider and strenuous exercise, medication, acute glomerulonephritis, ureteral stones, kidney cancer and so on. 1. Strenuous exercise: some patients will change the glomerular filtration membrane permeability, resulting in red blood cells in the urine and cause hematuria, urine routine examination found urinary occult blood. 2. medication: if men overdose with anticoagulant drugs, such as heparin, before doing routine urinalysis, it may lead to positive urinary occult blood. At the same time, chemicals and cyclophosphamide, adriamycin and other antitumor drugs can also lead to some men’s urine routine examination of positive urinary occult blood, mainly related to the adverse effects of drugs or affect kidney function. 3. Acute glomerulonephritis: mainly associated with β-hemolytic streptococcal infection to change the glomerular basement membrane permeability, so that the erythrocyte filtration increased. Typical symptoms of patients include hematuria, proteinuria, edema, and elevated blood pressure. Some male patients may have positive urinary occult blood when they go to the doctor for examination. 4. Ureteral stones: the disease is related to metabolic abnormalities, stone damage to the local mucosa to make urine occult blood positive. Some patients are also easy to be accompanied by back pain, frequent urination, urgency, painful urination and other uncomfortable symptoms. 5. Kidney cancer: the disease can also cause occult blood in urine in some men, which is mainly related to the invasion of normal tissues by cancer cells. The cause of kidney cancer is still unclear, and it may be related to heredity, smoking, obesity and other factors, and the common manifestations of patients include hematuria, abdominal mass and so on. There are many causes of urinary occult blood in routine urine test for men, such as cystitis, kidney stones, massive burns, etc. It is recommended to do further detailed examination to confirm the diagnosis.