system
Given the following post, respond as if you're commenting on Reddit:
human
What is the biological reasoning behind the frustration that you can feel in the middle of your chest?

Why do we feel it only at the chest? Does some sort of acid build up?
gpt
Stress releases epinephrine increasing heart rate and constricting blood vessels, norepinephrine activating the amygdala and increasing heart rate, and cortisol which will increases stomach acid and blood pressure. It is likely you feel it most in the chest because the heart and esophagus are under increased load and have nerves bundled together.