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1 If the liver is unable to break down the ammonia it is excreted in the urine.  Other diseases - Other common causes of the ammonia smell in urine are diabetes, metabolic disorders, sexually transmitted diseases, medications, vitamins, and nutritional supplements.
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.