Two plus signs of occult blood in the urine means that there may be red blood cell urine. There are some dietary factors or medications that can also cause a positive occult blood. If the body eats a diet that contains a lot of vitamin C, it can also cause a positive occult blood. There are many reasons for having occult blood, positive red blood cells, and hematuria, such as common nephritis, urinary tract infections, kidney cysts, stones, tumors, or having tuberculosis, all of which can lead to positive occult blood. The specific red blood cell pattern should be combined to clarify what the cause is. If it is nephritis, usually the red blood cells will be deformed, and the deformation is >80%. If it is caused by other reasons, the deformation is generally less, and should be combined with other clinical history and examination to clarify what the cause is.