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Gastroparesis is a condition in which the stomach muscles do not work properly. As a result, food empties from the stomach very slowly, or not at all. Children with this disorder may feel full all the time, be very nauseous, have pain or vomit undigested food left in the stomach.
Gastroparesis may be caused by damage to the vagus nerve or by severe type 2 diabetes. 1  Most people with gastroparesis have one or more of the following symptoms: 2  Nausea. 3  Vomiting after meals. 4  Pain in the abdomen. 5  Bloating. 6  Feeling full after eating small quantities of food. 7  Lack of appetite. 8  Excessive unintentional weight loss.