Bright red rectal bleeding	Occult blood
Hemorrhoids	Gastritis
Diverticula	Gastric ulcer
Regional enteritis	Gastric carcinoma
Ulcerative colitis	Esophageal varices
Infectious colitis (entero-hemorrhagic)	Arteriovenous malformation
Carcinoma	Esophageal tumor
Polyps	Esophagitis
Arteriovenous malformation	Hiatal hernia
Intussusception	Duodenal ulcer
Fistula	Duodenitis
Fissure	Polyps
Chronic solitary ulcer	Carcinoma
	Diverticula