Colonoscopy, Upper endoscopy, Endoscopic mucosal resection, Ablation, Esophageal manometry, GI motility test, Esophagea...l dilatation, Breath testing, Anorectal manometry, Impedance pH testing, pH testing, Bravo capsule pH test, Constipation, Colon cancer, Esophageal cancer, Gastrointestinal disorder, Indigestion, Dysphagia, Achalasia, Gastroesophageal reflux disease, Gastrointestinal bleeding, Barrett's esophagus, Esophagitis, Gastroparesis, Esophageal spasms, Pelvic floor dysfunction, Chronic gastrointestinal bleeding, Polyp, Esophageal stricture, Esophageal foreign body , Gastrointestinal varices, Gastrointestinal perforation, Colonic dysmotility, Radiation proctopathy