Anal fissure
Anal fistula
Anal malignancy
Anal tags
Anorectal abscess
Colorectal malignancy
Condyloma acuminata
Constipation
Crohn's disease
Cryptitis
GC/Chlamydia<unk> s<unk> 
External<unk> 
Pedunculated polyp
Pilonidal cyst
Proctitis
Pruritus ani
Rectal foreign body
Rectal prolapse
Syphilitic fissure<unk> 
External<unk> 
Upper GI Bleeding
Diverticular disease
Diverticulosis
Diverticulitis
Vascular ectasia / angiodysplasia
Inflammatory bowel disease
Infectious colitis
Mesenteric Ischemia / ischemic colitis
Meckel's diverticulum
Colorectal cancer / polyps<unk> s<unk> 
External<unk> 
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<unk> 
External<unk> 
Nearly 100% mortality if untreated
Consider in patients with gastrointestinal bleeding and known abdominal aortic aneurysms or aortic grafts
Internal hemorrhoid
Anal fissure
External hemorrhoid
Anal fistula
Anal malignancy
Rectal prolapse
Anal tags
Anorectal abscess