How can anxiety cause nausea or IBS
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I feel like this is a tough question to answer like you are five years old because as a whole given that we are just starting to understand how the gut plays into our psychology. Most of your body’s [serotonin resides in the gut](https://my.clevelandclinic.org/health/articles/22572-serotonin), which some have even gone as far as calling our “[second brain](https://hms.harvard.edu/news-events/publications-archive/brain/gut-brain).” I’m not sure the evidence for that is complete, but hopefully, someone will come along and correct/annotate what I’ve said.
Also, as mentioned, the basic “fight or flight” function can also be the cause of it in the short term, as others have noted. Adrenaline would be the significant contributing factor in this context.
tl;dr: We have biochemical feedbacks in our physiology that respond to environmental factors in different ways, and there is no definitive answer that encompasses all cases.
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