Positive urinary occult blood is mostly seen in patients with hematuria due to urinary tract infections, urinary stones, early stage of renal tumors, anaphylactic purpura, etc. It can also be seen due to physiological factors such as strenuous exercise. In addition, myoglobinuria caused by rhabdomyolysis or hemoglobinuria caused by intravascular hemolysis will also show positive urine occult blood. 1. Urinary tract infection: patients mainly manifested as urinary pain, cloudy urine and other symptoms, urine routine can be seen red blood cells and leukemia. 2. Urinary stones: when the stone obstructs the urethra, it will cause difficulty in urination, pain, dysuria and other symptoms, and blood in the urine can be seen by the naked eye. 3. Kidney tumor: early tumor is small and asymptomatic, with the development of the disease, there may be pain, lumps, positive occult blood in urine, fever, malignant fluid and so on. 4. Anaphylactic purpura: common symptoms include joint pain, abdominal pain, skin rash, positive urine occult blood, etc. 5. Physiological factors: such as women’s menstrual period, menstrual blood mixed into the urine, there will be a positive urinary occult blood; after strenuous exercise may appear positive urinary occult blood, after rest can return to normal. Positive urinary occult blood is also seen in many other causes, such as systemic diseases coagulation dysfunction and so on. When the urine occult blood positive, it is recommended that the patient timely hospital consultation, improve the examination, clarify the cause of the disease, targeted treatment.