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Your food pipe (called the oesophagus) is a tube that runs from your mouth to your stomach.
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Your stomach is where your food is digested.
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There is a ring of muscle between your food pipe and your stomach.
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When you eat, food travels down your food pipe. The ring of muscle between the food pipe and your stomach opens to let the food go into the stomach.
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The ring of muscle then closes again – so that food or acid from your stomach cannot go back up into your food pipe.
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Sometimes this ring of muscle is not able to close properly. Some food and acid from your stomach can then flow back up into your food pipe towards your throat.
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This causes heartburn – a painful burning feeling in your chest.
If you have heartburn every now and then, this isn’t dangerous.
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If you keep getting a lot of heartburn, it is called gastro-oesophageal reflux disease (GORD).
This can cause more serious problems.
Download our easy read guide to GORD (pdf)
Read more about the link between GORD and learning disability