system
A chat on subreddit /r/me_irl
human
Oh yep! I also have this. Ever since I was super young. Just turned 31 today and while it's dwindled, I still get them. My dad always told me "your lungs are sticking to your ribs". Lmao

You literally cannot breathe past a certain point without some outrageous pain. 

I had to hunch forward and take super shallow breaths and twist and contort until the pain went away. 

What a weird thing to just... have to do.
gpt
I'm 31. Can confirm that I have this, which I thought it was my acid reflux. I just keep breathing up to the point before the pain, or sit up straighter. Usually goes away. Also have Tachycardia, so also get random stabbing pain if I lay on my left side wrong. Doctors were not concerned after multiple heart monitor tests, and ultrasound. Human bodies, huh?