Blood in urine, also known as hematuria, can be a sign of a serious illness and should not be ignored. Hematuria can be caused by a variety of factors, including infections, kidney stones, medical kidney disease, vigorous exercise, and kidney, bladder, or prostate cancer
. Inherited illnesses such as sickle cell anemia and Alport syndrome can also cause blood in urine. If you notice blood in your urine, it is important to see a healthcare provider to determine the cause and receive appropriate treatment.