Urinary occult blood is one of the indicators of urinary routine examination, which mainly refers to the presence of red blood cells in urine. Simple urine occult blood means that in addition to urine occult blood, other indicators are normal, there is no urine protein, at this time the doctor may say to the patient is fine, this is because the simple urine red blood cell increase may be a normal physiological increase, such as menstrual flow, strenuous exercise, drug stimulation, stay up late, etc. The following common factors can cause urine occult blood in routine urine examination, generally no special treatment: 1, menstrual flow This is mainly due to the contamination of the urine with menstrual blood, which leads to high red blood cell content in the urine; 2, strenuous exercise: strenuous exercise can lead to redistribution of blood throughout the body, and blood flows into the heart, lungs and other tissues, and the amount of blood flowing through the kidneys is significantly reduced, and the glomerulus will have increased permeability due to ischemia. This leads to the red blood cells entering the urine through the blood vessel wall and presenting the result of urinary occult blood in the routine urine examination, but the body does not have pathological changes; 3, drug stimulation: some people have taken antibiotic drugs such as levofloxacin and gentamicin before the routine urine examination due to cold, fever, etc., which may cause abnormal adverse reactions in the urinary system, so the urinary occult blood can appear during the examination, generally after stopping the drug The symptoms will be relieved by themselves after stopping the medication; 4. Staying up late: Staying up late for a long time can lead to insufficient sleep time, and when the brain cannot get sufficient rest, it may cause abnormalities in the endocrine system of the body, resulting in a physiological increase in the red blood cells in the urine and the performance of urinary occult blood during routine urine examination.