Breath testing, pH testing, Gastric emptying study, Gastrointestinal transit study, Upper endoscopy, Impedance pH testi...ng, Bravo capsule pH test, Esophageal manometry, Anorectal manometry, Colonoscopy, Gastroparesis, Indigestion, Intestinal pseudo-obstruction, Achalasia, Visceral pain, Constipation, Irritable bowel syndrome, Gastroesophageal reflux disease, Functional dyspepsia, Dysphagia, Small intestinal bacterial overgrowth, Pelvic floor dysfunction