It is possible that scar tissue related to the surgery, could have created some traction on the esophagus, contributing SOME to the reflux. Esophageal reflux is VERY common. Things that contribute to reflux; caffeine, nicotine, alcohol.
I assume they have put you on one of the proton pump inhibitors (Prilosec, Prevacid, Protonix, Nexium) - they are the most effective medications for this problem. If you do use caffeine, nicotine or alcohol, I would suggest stopping or reducing your use.
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