Diverticulosis vs Diverticulitis
How to tell Diverticulosis and Diverticulitis apart when a board question makes them look alike.
Diverticulosis is pockets or painless bleeding; diverticulitis is inflamed pockets with pain, fever, and CT inflammation.
Side by side
Often asymptomatic colonic diverticula, usually sigmoid/left-sided, or painless hematochezia that often comes from right-sided diverticular bleeding.
Inflamed diverticula causing left lower quadrant pain, fever, leukocytosis, bowel habit change, and possible abscess or perforation.
Mucosa and submucosa herniate through weak points in the muscular wall where vasa recta penetrate.
Mucosal inflammation with focal microperforation triggers pericolic inflammation and sometimes complicated infection.
Colonoscopy or imaging may show diverticula; painless lower GI bleeding supports uncomplicated diverticulosis.
CT with colonic wall thickening, pericolic fat stranding, abscess, or extraluminal air supports diverticulitis.
The trap
Both involve colonic diverticula (outpouchings of mucosa and submucosa through the muscularis, most common in the sigmoid colon), but the clinical pictures differ. Diverticulosis is the asymptomatic anatomic finding seen on screening colonoscopy in many older adults, or it presents with PAINLESS lower GI bleeding from erosion of a vessel at the neck of the diverticulum (it is the most common cause of acute lower GI bleeding in adults over 60). Diverticulitis is the INFLAMED, often microperforated diverticulum with localized peritonitis, presenting with left lower quadrant pain, fever, leukocytosis, and change in bowel habits; CT shows pericolic fat stranding, bowel wall thickening, and sometimes abscess. Avoid colonoscopy in acute diverticulitis (risk of perforation); arrange follow-up colonoscopy at 6 to 8 weeks after resolution to rule out colon cancer.
Watch it explained
Test it nowThe repair move
For diverticular disease, ask whether the stem shows quiet pockets/bleeding or infected inflamed pockets.
Try a free question
CoreA 69-year-old has sudden painless hematochezia. Colonoscopy later shows multiple sigmoid diverticula without surrounding inflammation. Which diagnosis best explains the bleeding?
Show answer and explanation
Answer: A. Diverticulosis. Painless lower GI bleeding from diverticula is a classic diverticulosis presentation.
Why the other choices are tempting
- B. Diverticulitis should add focal pain, fever, leukocytosis, or CT inflammation.
- C. Ischemic colitis usually causes crampy pain with bloody diarrhea in a vascular-risk setting.
- D. Ulcerative colitis causes chronic inflammatory bloody diarrhea rather than isolated painless diverticular bleeding.
- E. Colorectal carcinoma can bleed but does not explain multiple noninflamed diverticula as directly.
Flashcards
Tap a card to flip it.
What presentation favors diverticulosis?
Asymptomatic diverticula or painless hematochezia favors diverticulosis.
What presentation favors diverticulitis?
Left lower quadrant pain with fever, leukocytosis, and CT inflammation favors diverticulitis.
Quick answers
What is the fastest way to tell Diverticulosis from Diverticulitis?
Diverticulosis is pockets or painless bleeding; diverticulitis is inflamed pockets with pain, fever, and CT inflammation.
What is the key clue for Diverticulosis?
Often asymptomatic colonic diverticula, usually sigmoid/left-sided, or painless hematochezia that often comes from right-sided diverticular bleeding.
What is the key clue for Diverticulitis?
Inflamed diverticula causing left lower quadrant pain, fever, leukocytosis, bowel habit change, and possible abscess or perforation.
What is the common trap with Diverticulosis vs Diverticulitis?
Both involve colonic diverticula (outpouchings of mucosa and submucosa through the muscularis, most common in the sigmoid colon), but the clinical pictures differ. Diverticulosis is the asymptomatic anatomic finding seen on screening colonoscopy in many older adults, or it presents with PAINLESS lower GI bleeding from erosion of a vessel at the neck of the diverticulum (it is the most common cause of acute lower GI bleeding in adults over 60). Diverticulitis is the INFLAMED, often microperforated diverticulum with localized peritonitis, presenting with left lower quadrant pain, fever, leukocytosis, and change in bowel habits; CT shows pericolic fat stranding, bowel wall thickening, and sometimes abscess. Avoid colonoscopy in acute diverticulitis (risk of perforation); arrange follow-up colonoscopy at 6 to 8 weeks after resolution to rule out colon cancer.