Risk factors

Discolored urine that isn't the result of foods or medications could be caused by a medical condition that affects urine color. Factors that put you at risk of medical conditions that can affect urine color include:

• Age. Tumors of the bladder and kidney, which can cause blood in the urine, are more common in older people. Men older than 50 occasionally have urinary blood due to an enlarged prostate gland.
• Family history. A family history of kidney disease or kidney stones makes it more likely that you'll develop these problems. Both can cause blood in the urine.
• Strenuous exercise. Distance runners are most at risk, but anyone who exercises vigorously can have urinary bleeding.