(1) Upper central abdominal pain or discomfort. The pain is mostly irregular and has nothing to do with diet，generally diffuse burning pain, dull pain, distending pain and so on.

(2) With an obvious sense of hunger, but feel full soon, there was a sense of satiety, and the amount of food intake decreased significantly. Some patients have obvious feeling of fullness after meal.

(3) Flatulence, acid reflux and nausea

(4) Others. Severe patients may have weight loss, glossitis and diarrhea.