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The presence of bacteria in the urine, such as with a urinary tract infection (UTI), can affect the appearance and smell of urine. When there is an infection in the urinary tract, the urine may take on a foul-smelling odor as well as appear cloudy or bloody.
Abnormal Urine Smell (Odor). 1  Foul smelling urine may be caused by bacteria, a common sign of a urinary tract or bladder infection. 2  Sweet smelling urine is a sign of diabetes or a rare disease of metabolism. 3  Musty smelling urine may be a sign of liver disease and certain metabolic disorders.