The normal situation of urinary routine occult blood is to present a negative result, if there is a plus one situation, it often suggests that the number of red blood cells in the urine, more than 3 per high magnification field of view is called urinary routine occult blood (+), often due to the following reasons: a. The common cause is urinary tract infection, patients often have the clinical manifestations of urinary frequency, urinary urgency, urinary pain, while urinary routine examination will appear urinary occult blood The patient will often have clinical manifestations of urinary frequency, urinary urgency, urinary pain, and at the same time, urinary routine examination will show urinary occult blood and urinary leukocytes (+). Second, a common cause is urinary stones, patients with urinary stones often have occult blood (+) due to damage to the urethral mucosa. Third, the common cause is urological tumors, patients often appear throughout the painless meatus hematuria, check the CT or ultrasound can help clarify the diagnosis. Fourth, the common cause of occult blood in urine is conditions such as glomerulonephritis, and patients often have a combination of hematuria, proteinuria, edema, and hypertension.