Reflux disease is caused by inappropriate relaxation or weakness in a muscle called the lower oesophageal sphincter (LOS). Normally the LOS acts like a one-way valve, allowing food and liquid to pass through to the stomach, but preventing stomach contents from flowing back into the oesophagus.
What Causes Reflux Disease?: Reflux... - Acid Reflux Support
What Causes Reflux Disease?

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