| Health science- Medicine- Gastroenterology
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| Diseases of the esophagus- stomach
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| Halitosis- Nausea- Vomiting- GERD- Achalasia- Esophageal cancer- Esophageal varices- Peptic ulcer- Abdominal pain- Stomach cancer- Functional dyspepsia
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| Diseases of the liver- pancreas- gallbladder- biliary tree
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| Hepatitis- Cirrhosis- NASH- PBC- PSC- Budd-Chiari syndrome- Hepatocellular carcinoma- Acute pancreatitis- Chronic pancreatitis- Pancreatic cancer- Gallstones- Cholecystitis
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| Diseases of the small intestine
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| Peptic ulcer- Intussusception- Malabsorption(e.g. celiac disease, lactose intolerance, fructose malabsorption, Whipple's disease) - Lymphoma
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| Diseases of the colon
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| Diarrhea- Appendicitis- Diverticulitis- Diverticulosis- IBD(Crohn's diseaseand Ulcerative colitis) - Irritable bowel syndrome- Constipation- Colorectal cancer- Hirschsprung's disease- Pseudomembranous colitis
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