Blood in urine is considered to be caused by the following conditions: the first condition is considered to be caused by urinary tract infections, which may result in frequent and urgent urination, high fever, stinging urine and elevated white blood cells; the second condition is considered to be caused by urinary tract stones, which may result in significant pain in the lower back and abdomen; the third condition is considered to be caused by hemorrhoids, which may result in bleeding, a small amount of bleeding, and painful. The fourth case is considered to be caused by urinary tumors, the main symptom is blood in the urine, and there is no pain, mainly occurs in elderly patients; in addition to the appeal of several cases, there may be due to anal fissures and urethral inflammatory infections, it is recommended to go to the hospital in a timely manner to do routine urine examination and anal examination, after confirming the cause, and then take appropriate treatment measures according to the cause.