Possible causes of urinating blood include a urinary tract infection, a kidney infection, bladder stones and kidney stones, according to Mayo Clinic. Other possible caused of blood in the urine include an enlarged prostate, kidney disease, cancer and a kidney injury. Blood in the urine may also be caused by inherited disorders, such as Alport syndrome or sickle cell anemia.
Medications such as penicillin and cyclophosphamide may cause blood in the urine, notes Mayo Clinic. Taking a coagulant and the blood thinner heparin while having a condition that causes the bladder to bleed may cause visible urine in the blood. Although it happens rarely, intense exercise can cause blood in the urine, although the exact reason is unknown, as of 2015. While it can occur after any strenuous physical workout, blood in the urine is most common after running.
Bloody urine can occur without signs or symptoms, states Mayo Clinic. The bleeding is not usually painful, and it can take a very small amount of blood to turn the urine pink, red or cola-colored. Some medicines such as the laxative Ex-lax or foods such as beets, rhubarb or berries may cause the urine to appear red, but bloody urine looks very different and distinct. Because bloody urine may not always be caused by exercise, drugs or food, it is important to see a health care professional if it occurs.