Your stomach is located beneath the sheet of muscle called your diaphragm. Lying down often contrib...
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Your stomach is located beneath the sheet of muscle called your diaphragm. Lying down often contributes to reflux or backing up of stomach acid, known as GERD, through the same valve that opens to let food or liquid enter from the esophagus. Sitting up can help reduce reflux of acid. The ability to move stomach contents up through this valve can also be helpful, such as getting rid of excess air in your stomach or vomiting up something poisonous.
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