Several instances of irregular digestion are listed in the table below. condition description symptoms heartburn inability of the muscles at the end of the esophagus to close burning sensation in throat peptic ulcers an open wound in the lining of the stomach sharp pain between chest and belly button, nausea constipation condition where a person has infrequent and uncomfortable bowel movements infrequent bowel movements, nausea lactose intolerance inability to digest or break down the lactose in milk products diarrhea, gas, nausea, and bloating maria loves ice cream, but lately she has become aware that she feels nauseated after eating it. from which condition is maria to suffering?