Dysphagia Gastroesophageal Reflux Disease Peptic Ulcer Disease Approach to Elevated Liver Enzymes Diseases of the Gallbladder and Biliary Tree Disorders of the Pancreas Inflammatory Bowel Disease Functional Gastrointestinal Disorders Approach to Diarrhea Benign Colorectal Disorders Colorectal Cancer Screening and Iron Deficiency Anemia Gut Microbiome and Dietar Considerations