A fishy odor is the single characteristic of trimethylaminuria. Some people give off a constant odor, though, for most, the scent varies in intensity. Actions that cause a person to sweat more, such as exercising or stress, may worsen the smell. Additionally, females may notice that the odor intensifies before and during menstruation. Most people have no other symptoms, though there are cases of anemia, increased spleen size, and low blood neutrophil counts.
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