- Exclusion criteria for the population: diagnosis of gastroparesis with known cause: secondary to diabetes, post surgical or isolated disorders of motility (Parkinson's disease, non-obstructive pancreatic carcinoma, post-abdominal irradiation, atrophic gastritis, celiac arterial occlusion, Crohn's disease, Chagas disease, varicella zoster), active regular/daily marijuana users or have a diagnosis of cyclical nausea/vomiting abdominal pain secondary to regular marijuana use, alcoholics, history of gastrectomy or current gastric electrical stimulator implant, pregnancy, have any schizoaffective or borderline personality disorder, or received osteopathic manual treatment within the last year.