Table 1. Common causes of GI bleeding.

Upper gastrointestinal bleeding (Zurkiya and Walker)

Esophageal, gastric and duodenal ulcers

Mallory Weiss tears

Esophagitis, gastritis, duodenitis, pancreatitis

Neoplasms

Vascular malformations

Varices

Lower gastrointestinal bleeding (Strate and Gralnek-2016)

Diverticulosis

Angioectasia

Post-polypectomy bleeding

Ischemic colitis

Colorectal polyps/neoplasms

Dieulafoy’s lesion

Inflammatory bowel disease

Anorectal conditions, i.e., solitary rectal ulcer, radiation proctitis and rectal varices

Small bowel bleeding (ACG guidelines 2015)

Inflammatory bowel disease

Angioectasia

Dieulafoy’s lesion

Neoplasia

Meckel’s diverticulum

NSAID ulcers

Polyposis syndromes

GI, gastrointestinal; ACG, American College of Gastroenterology.