Depends on amount: How much blood? Visible to you, just on a chemical dipstick test, or abnormal # red blood cells on microscopic exam of urine. Only of concern if visible or abnormal cells on micro. Numerous causes: if micro cells, often no serious cause; microscopic disease of kidney tissue; stones, trauma, vigorous exercise/running; tumor/cancer - rare at your age; infection.
Answered 11/17/2017
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