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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 is laden with urea, a byproduct of protein metabolism. Urea is related to ammonia and is the main reason why our urine has an ammonia-like odor. There are several other substances that are in human urine which can also contribute to its odor. Concentrated urine as a result of dehydration means that solutes such as urea are in a higher concentration.