Several underlying medical conditions and systemic diseases can cause noticeable, unusual, or severe bad body odor due to altered metabolic processes. Common examples include trimethylaminuria (fish malodor syndrome, where the body cannot break down certain compounds), diabetes ketoacidosis (which produces a sweet, fruity acetone breath odor), liver or kidney failure (causing ammonia-like or musty odors), hyperhidrosis (excessive sweating), and specific metabolic or genetic disorders that alter skin chemistry and bacterial interaction.
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