There's degrees. For many years, I'd sometimes have a pressing pain somewhere on the left side of my chest. For years I wondered if it was something with my heart or my lungs, but it turns out that's what it feels like if stomach acid enters your oesophagus. It doesn't have to get all the way up to your throat to be a problem, though that also sometimes happens recently.

Took years for me to get this diagnosed, but now I take pills to reduce stomach acid production, I eat less in the evening, and maybe I'll add this training now.