- Barrett's Esophagus see Esophagus Disorders
- Bile Duct Diseases
- Biliary Cirrhosis see Bile Duct Diseases
- Biliary Tract Diseases see Bile Duct Diseases ; Gallbladder Diseases
- Norwalk Virus Infections see Gastroenteritis
- Ostomy
- Pain, Abdominal see Abdominal Pain
- Pancreas Transplantation
- Pancreatic Cancer
- Pancreatic Diseases
- Peptic Ulcer -- What I Need to Know about Peptic Ulcers (National Digestive Diseases Information Clearinghouse)
- About Porphyria -- Overview (American Porphyria Foundation)
- Proctitis see Anal and Rectal Diseases
- Pruritus Ani see Anal and Rectal Diseases
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