Gastroparesis Registry 3

Inclusion Criteria: * Symptoms of gastroparesis of at least 12 weeks' duration with varying degrees of nausea, vomiting, early satiety, postprandial fullness * An etiology of either diabetic, idiopathic, or post-fundoplication (Nissen, Dor, or Toupet) gastroparesis or gastroparesis-like disorder (symptoms of gastroparesis but normal gastric emptying) * Gastric emptying scintigraphy of solids using the 4-hour Egg Beaters® protocol (or equivalent generic liquid egg white meal) within the last 6 months with either: * Abnormal gastric emptying rate defined as an abnormal 2 hour (\>60% retention) and/or 4 hour (\>10% retention) result based on a 4 hour scintigraphic gastric emptying study. (This group will comprise \~75% of patients in the registry.) * Patients with a normal gastric emptying rate, but who have symptoms of gastroparesis. (This group will comprise \~25% of patients in the registry.) * Negative upper endoscopy or upper radiographic GI series within 2 years of registration * Age at least 18 years at initial screening visit Exclusion Criteria: * Inability to comply with or complete the gastric emptying test by scintigraphy (including allergy to eggs) * Use of narcotic analgesics greater than three days per week * Presence of other conditions that could explain the patient's symptoms: * Pyloric or intestinal obstruction: by EGD, UGI, or Abdominal CT * Active inflammatory bowel disease * Known eosinophilic gastroenteritis or eosinophilic esophagitis * Primary neurolog…