system
Given the following post, respond as if you're commenting on Reddit:
human
How do anxiety disorders affect our brains on a neuro level?

I wanted to know what happens inside our brains when we feel anxious for long periods of time.

Does it damage our brain or is it more like a passing headache?
gpt
Well, for one, your amygdala grows larger.    
The bigger it gets the more sensitive it gets and sends more signals to the hypothalamus for a flight/fight response. Even when there's no real threat, you're constantly under pressure to defend yourself or get away.