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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.
Urea is then excreted in the urine. If your kidneys cannot handle the load of nitrogen, then the nitrogen will be excreted as ammonia in your sweat. One other factor to consider is water intake. The methods used for getting rid of excess ammonia, such as urine and sweat, all require water as a transport mechanism.