Yes and no.

Yes, it is a very real physiological response in the body.

No, it is not always valid and true.

So we have to develop the discernment to know which fears are legit and which ones are bullshit (spoiler - most of them are bullshit). So that's what today's bite sized nugget of wisdom is all about. Gain control over your fears, or they will rule your life. It's that simple.