How does a thought of something make you feel like throwing up?

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How does a thought of something make you feel like throwing up?

In: Biology
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Depends on if your thought is something gross like a rotting animal or something that makes you emotionally unwell. For the rotting thing, we have a cephalic digestive phase that gets us ready to eat. Its why we start to salivate when we smell something good. In like manner this can also prevent us from eating if we sense that it will make us sick, or in cases where we’ve ready eaten, throw it up. If you think of something gross that cephalic, or mental aspect of digestion, can make you vomit.

In terms of nervousness, you get a spike in something called the sympathetic nervous system which shuts down your GI tract to conserve blood for muscles and brain. Sometimes this effect can result in feeling unwell and even a need to vomit