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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.
Urine in itself does not have a strong smell, unless it is concentrated. Dehydration, often causes foul-smelling urine. When you are dehydrated, the amount of water in the urine decreases, while that of ammonia and other chemicals increases, which makes the urine more concentrated, and changes its color and odor.