system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: What is that pressure sensation we feel in our chest when we get a spike of anxiety?
gpt
I believe it is adrenaline, the fight or flight reflex. But modern man doesn’t necessarily have the same fight or flight reflex as our ancestors - it’s more fight, flight or freeze. Most people freeze but the body still release the adrenaline used from the original fight or flight.