Butterflies in the stomach
Butterflies in the stomach is the physical sensation in humans of a "fluttery" feeling in the stomach, caused by a reduction of blood flow to the organ. This is as a result of the release of adrenaline in the fight-or-flight response, which causes increased heart rate and blood pressure, consequently sending more blood to the muscles.
It can be a symptom of social anxiety disorder. The symptom of this phenomenon is usually experienced prior to attempting to partake in something critical.
