I've got that but fortunately it doesn't give me much trouble. I sometimes feel bloated even if I've had nothing to eat and very occasionally it hurts a bit.
In my case what has happened is that things have "loosened up" where the oesophagus joins the stomach so instead of being a rigid connection there is some movement.
It's exactly like this. A major problem is that oesophagus and stomach have different linings, called "mucosae": the stomach one produces acids (HCl) that irritate the oesophagus...creating problems.
The special 'one-way' valve between oesophagus and stomach (cardias: a burping device) cannot work properly anymore.
Antiacids help.
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