Nursing Field Notes / GI · Pathophysiology Course

Diverticular Disease 🫘

Diverticulosis vs Diverticulitis — Pouches vs Pouches on Fire

NG-303 GI ADHD-friendly visual edition

Diverticulosis = little pouches ("stress bubbles") on the colon wall — usually silent. Diverticulitis = those pouches become inflamed & infected — pain, fever, and a possible medical emergency.

🫘 -OSIS = pouches, quiet-ITIS = pouches inflamed & infected.

📍 LLQ pain"Left-sided appendicitis" — sigmoid colon.

🍿 Flip the dietFlare = low fiber/NPO. Quiet = HIGH fiber.

🚫 NO barium enema/colonoscopyduring an acute flare — perforation risk.

🧨

CAUSE

STEP 1 · POUCHES FORM, THEN CATCH FIRE

Low fiber → chronic constipation → high pressure → pouches. Then something plugs a pouch and it gets infected.

🫘 Two stages of the same disease

🧠 "-OSIS is quiet, -ITIS is on fire." Same word root as every other -osis/-itis pair — osis = condition present, itis = inflammation happening now.

⚠️ Causes

🥦 Low fiber diet → chronic constipation
📈 Increased pressure within the bowel from straining
🌰 Popcorn, seeds, nuts — classically taught to lodge in a pouch and trigger inflammation
👴 Aging — colon wall weakens over time
⚖️ Obesity, low activity, smoking

🧠 Note: newer evidence questions whether seeds/nuts/popcorn truly trigger flares, but this pairing is still classically tested — know it for the exam.

📍 Where it hurts — and why it's called "left-sided appendicitis"

Diverticula form most often in the sigmoid colon (descending colon), which sits in the Left Lower Quadrant (LLQ) — a mirror image of appendicitis' RLQ location.

🧠 RLQ = appendicitis. LLQ = diverticulitis. Same pain pattern, mirrored side.

🔎

CLUES

STEP 2 · SPOT THE FLARE

Fever + LLQ pain + rising WBC = an active flare, not the quiet pouches.

⚖️ Diverticulosis vs Diverticulitis — the exam table

	🫘 Diverticulosis	🔥 Diverticulitis
What	Pouches present, no inflammation	Pouches inflamed & infected
Symptoms	Usually asymptomatic, found incidentally	Fever & chills, LLQ pain
Labs	Normal	↓ H/H · ↑ WBC
Diet	High fiber — keeps bowels clean	NPO → clear liquids → low fiber during flare
Danger	Low — manage with diet	Can perforate → peritonitis — emergency

🧠 Flip the diet with the diagnosis: quiescent = load up on fiber; flaring = starve the inflamed pouch (NPO/low residue).

🚩 Signs & symptoms of a flare

🌡️ Fever & chills
📍 Pain LLQ (descending & sigmoid colon)
🤢 Nausea, change in bowel habits

🧪 Labs — highly tested

Decrease H/H (Hemoglobin & Hematocrit) — from bleeding/inflammation.

Increase WBC — infection is present.

🧠 ↓H/H + ↑WBC — bleeding down, fighting cells up. Chart both.

🚨 Complication: perforation → peritonitis — Report to HCP

🪵 Rigid, "board-like" abdomen
📈 Worsening abdominal pain, distension
🌡️ High fever, tachycardia

NCLEX TIP Report to HCP immediately — this is a medical emergency.

🧠 Same peritonitis picture as appendicitis (NG-302) — different organ, identical red flags.

🩺

CARE

STEP 3 · MATCH THE DIET TO THE PHASE

The single most tested idea on this topic: the diet flips depending on whether the bowel is inflamed right now.

🍽️ Diet progression during an acute flare

🚫NPOnothing by mouth

🥤Clear liquidsjello, broth, juices

🥣Low fiber dietlet the bowel rest

🥦High fiber againonce resolved

HIGHLY TESTED Diverticulitis flare-up: NPO → clear liquid diet → low fiber → eventually back to high fiber.

Diverticulosis (quiescent): high fiber diet = clean bowels & avoids constipation — the opposite instruction.

🧠 "Starve the flare, feed the quiet." Low fiber only exists to rest an inflamed bowel — it is never the long-term diet.

💊 Nursing care during a flare

💉 IV normal saline
💊 Pain meds — morphine, hydromorphone
🚫 NPO — bowel rest
🌡️ Monitor for fever, rising pain, rigidity

❌ Never during an acute flare

💦NO barium enema↑ abdominal pressure

🔬NO colonoscopyperforation risk

Both procedures push pressure or air into an already-inflamed, possibly weakened bowel wall.

✅ Long-term teaching (quiescent phase)

🥦 High fiber diet — cleans the bowel, prevents constipation
💧 Adequate fluids to go with that fiber
🚶 Regular exercise, avoid straining
🌰 Avoid: popcorn, seeds, nuts (classic teaching)

🧠 "POPCORN" — the classic 3: Popcorn · seeds/nOts · avoid — Prevent straining, Constipation control, Observe for flare, Regular exercise, Nutrition = high fiber.

⚡

QUICK RECALL

SAY IT OUT LOUD

🫘 -OSIS = quiet pouches🔥 -ITIS = inflamed & infected.

📍 LLQ pain= "left-sided appendicitis," sigmoid colon.

🍽️ Flip the dietFlare = NPO→low fiber. Quiet = high fiber.

🚫 No enema/colonoscopyduring an acute flare.

🎯 Cover & check — 4 rapid-fire questions

Q1: What's the difference between diverticulosis and diverticulitis?

Diverticulosis = pouches present, no inflammation, usually asymptomatic. Diverticulitis = those pouches are inflamed and infected — fever, LLQ pain, ↑WBC.

Q2: What diet do you give during an acute diverticulitis flare?

NPO → clear liquids → low fiber, progressing back to high fiber once the flare resolves.

Q3: What diet is recommended for diverticulosis (no active flare)?

High fiber diet — keeps bowels clean and prevents constipation, which prevents new pouches and flares.

Q4: Name two procedures to avoid during an acute flare, and why.

Barium enema (increases abdominal pressure) and colonoscopy (perforation risk) — both avoided until the flare resolves.