Here’s what you’re feeling: Cardiologist Dr. Mehmet Oz says when we’re nervous, our body produces adrenaline, triggering a fight-or-flight reaction, where blood rushes to our extremities in case we need to outrun a mugger. So, butterflies are the blood rushing OUT of your digestive tract. You may also need a bathroom because the hormone cortisol triggers the colon to contract, which can trigger instant diarrhea. So before a stressful situation, make sure you know where the nearest bathroom is!

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