Gross hematuria produces pink, red or cola-colored urine due to the presence of red blood cells. It takes little blood to produce red urine, and the bleeding usually isn't painful. Passing blood clots in your urine, however, can be painful.
Bloody urine often occurs without other signs or symptoms.
When to see a doctor
Make an appointment to see your doctor anytime you notice blood in your urine.
Some medications, such as the laxative Ex-lax, and certain foods, including beets, rhubarb and berries, can cause your urine to turn red. A change in urine color caused by drugs, food or exercise might go away within a few days.
Bloody urine looks different, but you might not be able to tell the difference. It's best to see your doctor anytime you see red-colored urine.