What could this pain in my chest be?

Every once in awhile I get this pain in my chest, its uncomfortable but not unbearable. Its almost like my chest feels hot. It usually lasts like 15 minutes or so, I guess it kind of feels like if you have to burp because I try and do that to see if the pain will go away lmao. But it never works. What could this be? Should I see a doctor? Have you had this happen? I am a smoker but I looked up heart disease and I don't think its that or anything.
What could this pain in my chest be?
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