What causes butterflies in your stomach?

Butterflies in the stomach is a common phrase used to describe a feeling of nervousness or excitement in the body. It is not actually caused by butterflies in the stomach, but rather by the body's natural response to stress or anticipation. When a person feels nervous, their body goes into "fight or flight" mode, which causes a release of hormones like adrenaline and cortisol. These hormones can cause the stomach to contract, leading to the sensation of butterflies. Other physical symptoms of nervousness can include increased heart rate, sweaty palms, and shallow breathing.