I was out on the floor on Tuesday, just carrying a routine tray of waters—maybe four or five glasses—when I felt this very distinct, sharp localized spasm right behind my sternum.

i was just sitting here trying to finish my thesis and i felt this sharp stab under my ribs...

I am currently experiencing a physiological manifestation of extreme discomfort in my chest cavity—a literal tightening of the intercostal muscles.

I woke up with a knot in my side that felt like a rusty nail being hammered into my gut.