![]() ![]() Sometimes, it may open more frequently than necessary or not close properly, allowing the stomach acids to flow into the oesophagus. ![]() In normal cases, it opens up to let in food or to let out burps. Sometimes, the lower oesophagal sphincter (LES), a muscular valve between the oesophagus and the stomach, doesn’t function properly. There could be many reasons why heartburn happens.
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