Upper GI Bleeding
Diverticular disease
Diverticulosis
Diverticulitis
Vascular ectasia / angiodysplasia
Inflammatory bowel disease
Infectious colitis
Mesenteric Ischemia / ischemic colitis
Meckel's diverticulum<unk>  / polyps
Hemorrhoids
Internal hemorrhoid
External hemorrhoid
Aortoenteric fistula
Nearly 100% mortality if untreated
Consider in patients with gastrointestinal bleeding and known abdominal aortic aneurysms or aortic grafts
Rectal foreign body
Rectal ulcer (HIV, Syphilis, STI)
Anal fissure
Diverticulosis
Diverticulitis
Internal hemorrhoid
External hemorrhoid
Nearly 100% mortality if untreated
Consider in patients with gastrointestinal bleeding and known abdominal aortic aneurysms or aortic grafts
Diverticulitis
Kidney stone
UTI
Pyelonephritis
Ectopic pregnancy
Infectious colitis
Inflammatory bowel disease (Crohn's Disease, Ulcerative Colitis)
Inguinal hernia
Mesenteric ischemia
Epiploic appendagitis
Mittelschmerz
Ovarian cyst
Ovarian torsion
PID
Psoas abscess
Testicular torsion
Appendicitis
Abdominal aortic aneurysm
Herpes zoster
Endometriosis
Colon<unk> 
Irritable bowel syndrome
Small bowel obstruction
Anal fissure
Anal fistula
Anal malignancy
Anal tags
Anorectal abscess<unk>  malignancy
Condyloma acuminata
Constipation
Crohn's disease
Cryptitis
GC/Chlamydia
Hemorrhoids
Internal hemorrhoid
External hemorrhoid
Pedunculated polyp
Pilonidal cyst
Proctitis
Pruritus ani
Rectal foreign body
Rectal prolapse
Syphilitic fissure
Internal hemorrhoid
External hemorrhoid
Colorectal cancer
Upper GI Bleeding
Colitis
Diverticular disease
Ischemic colitis
Diverticulosis
Peptic ulcer disease
Diverticulitis