Eli5: What is the stab around the chest that goes away after taking a deep breath? Why does it go away?
In: Biology
Generally it’s a muscle spasm or cramp. With any cramp the muscle is very tight (contracting) and so slowly and gently stretching it out can help to relax it to a loosened state. Breathing is generally slow and as we inhale the chest muscles are stretched.
You may be referring to [Precordial Catch Syndrome](https://en.m.wikipedia.org/wiki/Precordial_catch_syndrome).
I’ve experienced this for many years and it often scared the crap out of me until I was able to identify what I think I have been experiencing.
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