Presence of blood in urine is called as Hematuria. It is broadly classified into two types as gross: visible to naked eye or that can be seen and reported by patient and second type as Microscopic: invisible to naked eye or that is detected on urine testing and seen under microscope. There are various causes of hematuria that can range from innocuous finding in UTI to harbinger of potential malignancy.

Seeing blood in your urine can be alarming. While in many instances the cause is harmless, blood in urine (hematuria) can indicate a serious disorder.
Blood that you can see is called gross hematuria. Urinary blood that’s visible only under a microscope (microscopic hematuria) is found when your doctor tests your urine. Either way, it’s important to determine the reason for the bleeding.