Urinary occult blood 3+ is clinically indicated as urinary occult blood (++), which often appears in the results of routine urine tests, mainly referring to high red blood cells in the urine, and does not exclude women who undergo urine tests during menstruation, caused by blood contaminating the urine specimen. When the situation is relatively serious, the patient may have typical symptoms such as hematuria, but there are many causes for this condition, which often suggest that the patient may have urinary system diseases or other diseases.1. Urinary system diseases: Commonly found in urethral infections, urethral stones, urethral tumors, urethral tuberculosis, etc. Patients often have painful urination, urinary retention and other uncomfortable symptoms, and hematuria will appear when performing routine urine tests. It may also be caused by pyelonephritis, glomerulonephritis, cystitis, etc. It is mainly due to impaired microcirculation in the kidneys, which induces increased permeability of the kidneys, and patients will have proteinuria in addition to urine occult blood (++++). In addition, it is not excluded that it is caused by bladder cancer, kidney cancer, etc. At this time, in addition to urine routine, if there is a high risk of cancer, pathological histological examination can also be performed in conjunction with it; 2. Other diseases: mainly include thrombocytopenia, coagulation dysfunction, leukemia, hemolytic anemia and other conditions, all of which can induce patients to develop hematuria symptoms, resulting in an increase in the number of red blood cells in the urine, and therefore can be manifested in the urine routine examination as urine occult blood (++++).