During late-stage kidney problems, an individual may develop an issue called "ammonia breath." This symptom involves a metallic taste in the mouth and breath that smells similar to urine. Essentially, the body is attempting to remove urea from itself. Since it cannot do so through the kidneys, it pushes the urea out via the breath. As the urea reacts with saliva, it creates ammonia, which is responsible for the odd taste and smell.

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