The presence of red blood cells and occult blood in the urine suggests that the patient has hematuria. There are more causes of hematuria in patients, both urinary system causes and causes outside the urinary system. The urinary system causes are mainly various nephritis, such as IgA nephropathy, acute nephritis, acute progressive nephritis, chronic nephritis and so on. And the surgical aspects of hematuria are mainly kidney stones, urinary tract infections, tumors of the urinary tract, and so on. And diseases outside the urinary system, including diseases of organs around the urinary system, such as appendicitis, rectal cancer, pelvic inflammatory disease, and so on, but also include the manifestations of the urinary system caused by systemic diseases, such as systemic lupus erythematosus damages the platelets. Thrombotic thrombocytopenic purpura and hemophilia affect platelets and coagulation factors, all of which can lead to hematuria. Therefore, when the patient’s urine is found to be red or urine routine examination of microscopic hematuria, then you can judge from the above ideas, to clarify what causes, and then give treatment.