Diverticular Disease

A patient with left lower quadrant pain and low-grade fever may have a ticking time bomb in the colon — but the nursing response changes dramatically depending on whether it's -osis or -itis.

Diverticula are small outpouchings of the colonic mucosa and submucosa that herniate through weak points in the muscular wall (false diverticula), most commonly in the sigmoid colon. Diverticulosis is the presence of these pouches — extremely common after age 60 and usually discovered incidentally. It can cause painless, large-volume rectal bleeding (a leading cause of lower GI bleeding in older adults). Diverticulitis occurs when a diverticulum becomes inflamed or microperforation develops, presenting classically with left lower quadrant (LLQ) pain, low-grade fever, elevated WBC, and altered bowel habits. It is sometimes called "left-sided appendicitis." During acute diverticulitis, the priority is bowel rest: NPO or clear liquids, IV antibiotics (commonly metronidazole plus a fluoroquinolone), and pain management — avoid morphine, which increases intraluminal pressure. A CT scan with contrast is the gold-standard diagnostic. Colonoscopy is contraindicated during acute inflammation due to perforation risk — it is performed 6-8 weeks after resolution. Complications include abscess, fistula, perforation with peritonitis, and obstruction. For uncomplicated diverticulosis, nursing teaching focuses on a high-fiber diet (25-35 g/day), adequate fluid intake, and regular exercise to promote bowel motility and prevent stool trapping in diverticula.

Key Distinctions

Don't confuse diverticulosis (high-fiber diet encouraged, may cause painless bleeding) with diverticulitis (acute inflammation, bowel rest and low-fiber or NPO initially). Students mix up the diet: high fiber prevents diverticulitis but is restricted during an acute flare. LLQ pain signals diverticulitis; RLQ pain points toward appendicitis — the location distinction is heavily tested.

Clinical Pearl

Think: "-osis is quiet, -itis is angry." Quiet colon gets fiber; angry colon gets rest. Never scope an angry colon — and never give morphine to one either.