Inability to burp?

I don't know if anyone on here has ever heard of this, or if any of you are a doctor or a nurse, but I very rarely burp and I just read that it is because in order to burp, the upper sphincter of your esophagus has to relax, and though uncommon, some people have difficulty burping because for some reason that sphincter doesn't relax. I've been surfing the web trying to find out what would cause that (I can tell that's the case for me), but I can't find it anywhere! Does anyone have any idea why that sphincter in my esophagus doesn't "relax" like it's supposed to?
Inability to burp?
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