What causes the physical feeling of “nervous tummy”

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What causes the physical feeling of “nervous tummy”

In: Biology

Your body’s fight or flight response.
Assuming you mean the feeling of upset stomach before a big event like a speech or a date.
Your body can’t really process the fear of “Am I going to bungle this meeting?” or “Is this saber tooth tiger going to bungle me?” and responds in similar ways.
Digestion isn’t important short term. If you die in the next 30 seconds, it doesn’t matter if you have enough energy in 30 hours. So your body pulls focus and blood flow away from your digestive tract in order to put all power into responding to the “threat”.