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.

Butterflies in the Stomach.
Butterflies in the Stomach
No butterflies in the stomach: The collapse of insect-microbe symbiosis under climate change
A New Meaning to Butterflies in the Stomach
When the butterflies in the stomach prevail over the rationality: the case of alexithymia in intertemporal decision making
Summary of the Effect of Anxiety on Performance: An Athlete's Guide to Beating Butterflies in the Stomach
Butterflies in the Stomach: Is Genetically Modified Corn Harming Monarch Butterflies?
Neurotic butterflies in my stomach - a critical analysis
Butterflies in your stomach!
The Butterflies in Your Stomach