In fact, the most common cause of female blood in urine is urinary system infection. Urinary system infection, not only frequency of urination, urgency of urination, pain in urination, but also blood in urine, and even blood clots in urine in serious cases. In fact, the amount of bleeding is very large, but some may also show terminal hematuria, blood is found after urination, or blood is found when wiping. As for the situation of urine and blood, if we make a comprehensive analysis, we should consider it systematically. First of all, we should consider the causes of the urinary system itself, such as the infection just mentioned, stones, tumors, trauma and diseases in nephrology, such as glomerulonephritis. Moreover, we should consider whether there are systemic factors, such as bleeding diseases, blood diseases, hemophilia; Did you take any medicine, such as anticoagulant drugs, such as aspirin; Is there still some poisoning. Also consider the situation of adjacent organs of the urinary system, such as whether there will be vaginitis, pelvic inflammation, appendicitis, rectal cancer, colon cancer and other adjacent organs, which affect the urine blood caused by the urinary system. It is also necessary to consider whether there is a functional problem, such as exercise hematuria. If you exercise less at ordinary times and suddenly increase exercise, you can have transient exercise hematuria. Finally, when young, many people who grow faster and thinner will be called nutcracker, and she (he) will also have blood in urine. So if you want to urinate blood, you should go to the hospital for further comprehensive examination.