Gastroparesis Registry

Inclusion Criteria: * Symptoms of gastroparesis of at least 12 weeks duration (do not have to be contiguous) with varying degrees of nausea, vomiting, abdominal pain, early satiety, post-prandial fullness, * Completion of a 4-hour scintigraphic low fat Egg Beaters gastric emptying study * Patients with either or both abnormal 2 hour (\>60% retention) and 4 hour (\>10% retention) gastric emptying will be enrolled and classified as definite gastroparesis (Gp) * Patients with normal gastric emptying, but with symptoms of gastroparesis may be enrolled and classified as possible gastroparesis or gastroparesis-like with normal gastric emptying (GLNGE) * Age at least 18 years at initial screening visit * Ability and willingness to participate in follow-up Exclusion Criteria: * Inability to comply with or complete the gastric emptying scintigraphy * Presence of other conditions that could explain the patient's symptoms: * Pyloric or intestinal obstruction * Active inflammatory bowel disease * Eosinophilic gastroenteritis * Neurological conditions such as increased intracranial pressure, space occupying or inflammatory/infectious lesions * Acute liver failure * Advanced liver disease (Child's B or C) * Acute renal failure * Untreated chronic renal failure (serum creatinine \>3 mg/dL) * Total or subtotal gastric resection (patients with prior fundoplication or postvagotomy gastroparesis after pyloroplasty or antrectomy with Billroth I, Billroth II, or Roux-en-Y gastrojejunostomy will be eligible for enrollment) * Any other plausible structural or metabolic cause * Any other condition, which in the opinion of the investigator would interfere with study requirements * Inability to obtain informed consent