I’m a 17 year old female and I had a pain in my left side chest after eating breakfast. I do have a history of heartburn, though. Nothing else hurts, no jaw or arm or anything. And it’s not that bad of pain, like it’s not unbearable. My dads saying its just heartburn even though it’s in my heart and he said its possible for heartburn to feel that way. Do you know what I found? Heartburn. . It usually strikes after a meal and sometimes the pain can be so bad that it can confuse people into thinking it has to do with the heart but it doesnt. Try taking an antacid. Feel better.