7. Ammonia Breath
Kidney disease can also cause a metallic taste in the mouth or ammonia breath. This happens because poor kidney functioning leads to an increase in the level of urea in the blood. Urea is broken down to ammonia in the saliva, thus causing urine-like bad breath known as ammonia breath.
It can also cause an undesirable metallic taste in the mouth, which can make food taste different.
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