GI

Esophagus

1. GERD

2. Achalasia

3. Esophageal cancer (SCC, adenocarcinoma)

4. Boerhaave syndrome

5. Mallory-Weiss tear

6. Esophageal varices

7. Eosinophilic esophagitis

8. Plummer-Vinson syndrome

9. Schatzki ring

10. Esophageal stricture

Stomach

11. Acute gastritis

12. Chronic gastritis (H. pylori, autoimmune)

13. Peptic ulcer disease

14. Gastric adenocarcinoma

15. Gastric lymphoma

16. Menetrier disease

17. Zollinger-Ellison syndrome

Small Intestine

18. Celiac disease

19. Tropical sprue

20. Whipple disease

21. Lactose intolerance

22. Small bowel obstruction

23. Intussusception

24. Meckel diverticulum

25. Carcinoid syndrome

Colon

26. Ulcerative colitis

27. Crohn disease

28. Colorectal cancer

29. Familial adenomatous polyposis (FAP)

30. Lynch syndrome

31. Hyperplastic & adenomatous polyps

32. Diverticulosis

33. Diverticulitis

34. Ischemic colitis

35. Irritable bowel syndrome (IBS)

Liver

36. Acute viral hepatitis (A–E)

37. Chronic hepatitis (B, C)

38. Cirrhosis

39. Hepatocellular carcinoma (HCC)

40. Non-alcoholic fatty liver disease (NAFLD/NASH)

41. Alcoholic liver disease

42. Hemochromatosis

43. Wilson disease

44. Alpha-1 antitrypsin deficiency

45. Autoimmune hepatitis

Gallbladder & Biliary

46. Cholelithiasis

47. Cholecystitis

48. Choledocholithiasis

49. Ascending cholangitis

50. Primary sclerosing cholangitis

51. Primary biliary cholangitis

52. Gallbladder cancer

53. Biliary atresia

Pancreas

54. Acute pancreatitis

55. Chronic pancreatitis

56. Pancreatic adenocarcinoma

57. Pancreatic pseudocyst

58. Insulinoma

59. VIPoma

60. Glucagonoma

Vascular & Ischemic

61. Acute mesenteric ischemia

62. Chronic mesenteric ischemia

63. Ischemic colitis

64. Angiodysplasia

Peritoneal

65. Peritonitis

66. Spontaneous bacterial peritonitis (SBP)

67. Secondary bacterial peritonitis

Pediatric

68. Pyloric stenosis

69. Hirschsprung disease

70. Necrotizing enterocolitis

71. Meconium ileus

72. Duodenal atresia