What are common causes of hematuria?

Hematuria, which refers to the presence of blood in urine, can occur due to various underlying causes. Renal calculi, commonly known as kidney stones, are a significant cause of hematuria. When these stones move through the urinary tract, they can cause irritation or injury to the lining, resulting in bleeding. Trauma to the kidneys or urinary tract can also lead to hematuria; injuries can damage blood vessels and lead to bleeding.

While high blood pressure can complicate renal health, it is not a direct cause of hematuria. Other options like diabetes are more associated with chronic kidney disease and can lead to other types of urinary abnormalities rather than hematuria itself. Allergic reactions typically do not involve the urinary system in a way that causes bleeding. Therefore, renal calculi and trauma stand out as the most direct and common causes of hematuria.