It is always a symptom of a disorder, and a person with hematuria should consult a physician immediately. Small amounts of blood give urine a smoky or cloudy appearance.
Larger amounts make the urine dark red or dark brown.
But such discoloration is not always a sign of hematuria. Urine that has been standing for a while may naturally become cloudy. Reddish urine may be caused by pigments in certain foods, such as beets.