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Flu viruses attack and attach to cells in mucous tissue. This is most often the tissues of the nose, mouth, and eyes where the virus is most often introduced to the body, but it can also include the mucous tissue of the GI tract as well. This can cause nausea and vomiting. Another reason is that the post nasal drip and sputum from the flu that might get swallowed also can cause acid indigestion and vomiting. Some people get it from a gag reflex from thick mucus drainage in their throats or from coughing so hard their abdominal muscles and diaphragm get confused and try to help by triggering vomiting. It doesn't happen in all people or with all types of flu viruses, but some flu viruses, such as the Swine Flu virus, are known to cause this symptom more than other types of flu.

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12y ago
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Q: Why does the flu cause emesis?
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