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What is gastroparesis? Gastroparesis, also called delayed gastric emptying, is a disorder that slows or stops the movement of food from the stomach to the small intestine. Normally, the muscles of the stomach, which are controlled by the vagus nerve, contract to break up food and move it through the gastrointestinal (GI) tract.
1 The abnormal muscle contractions also cause pain.  Gastroparesis. This is what's called delayed gastric emptying â in other words, a stomach that's slow to empty itself. Your stomach muscles govern the movement of partly digested food through your stomach and into your small intestine.