Gastroparesis or Delayed gastric emptying is a medical condition consisting of a paresis (partial paralysis) of the stomach. This condition results in food remaining in the stomach for a longer period of time than normal.
In a normal individual, or one with no Gastroparesis or Delayed gastric emptying, the stomach contracts to move food down into the small intestine for digestion. The vagus nerve controls these contractions.
In people suffering from Gastroparesis or Delayed gastric emptying this vagus nerve is damaged and the muscles of the stomach and intestines do not work normally. Resulting in Food moving slowly or stop moving through the digestive tract.