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Gastroenterology›Condition·Updated Jun 26, 2026·v1

Diverticulitis

Diverticulitis is a common inflammatory condition of the colon that is increasingly managed conservatively. Diagnosis relies on CT imaging to stage the disease via the Hinchey criteria. While uncomplicated cases may not require antibiotics, complicated cases (abscess, perforation) require targeted antimicrobial therapy, drainage, or surgery. Long-term management focuses on high-fiber diets and lifestyle changes, with elective surgery reserved for those with significant quality-of-life impairment.

High Evidence152 references·7,344 words·30 min read·v1
GastroenterologyColorectal SurgeryAcute AbdomenDiverticular Disease

Quick Reference

RxDrug of choiceAmoxicillin-clavulanate 875/125 mg BID (if antibiotics indicated)
AltAlternativesCiprofloxacin 500 mg BID + Metronidazole 500 mg TID
DxTest of choiceCT Abdomen/Pelvis with IV contrast
ScKey scoreHinchey Classification (Stages I-IV)
→When to referAbscess ≥3 cm, free perforation, failure of outpatient therapy, or recurrent episodes impacting quality of life.
Uncomplicated diverticulitis in healthy patients often requires only supportive care; complicated disease requires CT-guided drainage or surgery and mandatory follow-up colonoscopy.
Diverticulitis is an inflammatory complication of colonic diverticulosis, occurring in 10% to 25% of patients with known diverticular disease. Historically viewed as a mechanical obstruction caused by fecaliths, modern understanding emphasizes a complex interplay of genetic susceptibility (accounting for ~50% of risk), microbial dysbiosis, and neuromuscular dysfunction. The clinical spectrum ranges from simple, uncomplicated inflammation to life-threatening complications including abscess, fistula, and free perforation (Hinchey III/IV). Management has undergone a paradigm shift: routine antibiotics are no longer mandatory for uncomplicated cases in immunocompetent patients, and surgical strategies now favor primary anastomosis over the Hartmann’s procedure for many perforated cases. Long-term care focuses on lifestyle modification—specifically high fiber and low red meat intake—rather than pharmacologic prevention, as agents like mesalamine have failed to show benefit in large-scale trials.

Overview and Recommendations

Background

  • •Diverticulitis represents the symptomatic inflammation or infection of colonic diverticula, which are mucosal herniations through the muscularis propria at points of vascular penetration (vasa recta).
  • •The incidence of the disease has risen to approximately 188 per 100,000 person-years in the U.S., with a significant and concerning shift toward individuals under age 50.
  • •Genetic susceptibility accounts for 40% to 50% of the risk, often involving loci related to connective tissue integrity (Type III to Type I collagen ratios) and epithelial barrier function.
  • •The Hinchey Classification remains the clinical gold standard for staging: Stage I (pericolic abscess/phlegmon), Stage II (pelvic abscess), Stage III (purulent peritonitis), and Stage IV (fecal peritonitis).
  • •Complicated diverticulitis—defined by the presence of abscess, fistula, obstruction, or perforation—carries a 1-year mortality rate of approximately 18.8% and requires aggressive intervention.

Evaluation

  • •Suspect acute diverticulitis in patients presenting with constant, localized left lower quadrant (LLQ) pain, though right-sided pain may dominate in Asian populations or cecal variants.
  • •Ask about alterations in bowel habits (constipation in 50%, diarrhea in 30%) and systemic symptoms like fever, nausea, or urinary urgency, which may suggest a developing colovesical fistula.
  • •Examine for localized tenderness or a palpable mass (suggesting phlegmon/abscess); immediate surgical consultation is required if diffuse peritonitis, rebound, or abdominal rigidity is present.
  • •Order a (leukocytosis is present in ~55% of uncomplicated cases) and C-reactive protein (CRP > 50 mg/L suggests complicated disease).
  • •Calculate the Neutrophil-to-Lymphocyte Ratio (NLR); a threshold > 5.11 may be more sensitive than CRP for identifying patients requiring surgical intervention.
  • •Order CT of the abdomen and pelvis with IV contrast as the gold-standard diagnostic test (sensitivity 94-99%) to confirm the diagnosis and identify complications like extraluminal air or abscess.
  • •Utilize MRI without gadolinium or ultrasound for pregnant patients to avoid ionizing radiation while assessing for bowel wall thickening (>3 mm) and fat stranding.
  • •Avoid acute during the initial presentation due to the theoretical risk of converting a contained perforation into a free perforation via insufflation.
  • •Schedule a follow-up colonoscopy 6 to 8 weeks after the resolution of symptoms to exclude colonic malignancy, which mimics diverticulitis on CT in up to 5% of complicated cases.

Management

  • •Omit routine antibiotics in immunocompetent patients with uncomplicated diverticulitis (Hinchey Ia) and mild symptoms, as they do not improve recovery or prevent complications.
  • •Initiate outpatient management for stable patients with clear liquids and close follow-up; transition to a high-fiber diet only after the acute phase resolves.
  • •Administer broad-spectrum antibiotics for complicated or high-risk cases: 400 mg IV every 12 hours plus 500 mg IV every 8 hours is a standard regimen.
  • •Utilize 3.375 g IV every 6 hours as an alternative for hospitalized patients with systemic inflammatory response syndrome (SIRS).
  • •Transition to oral 875/125 mg BID for a total 7–10 day course once the patient is clinically stable and tolerating oral intake.
  • •Refer for CT-guided percutaneous drainage if an abscess is ≥3 cm; collections <3 cm often resolve with IV antibiotics alone.
  • •Perform emergency for purulent (Hinchey III) or fecal (Hinchey IV) peritonitis; primary anastomosis is preferred over Hartmann’s procedure when hemodynamically feasible.
  • •Avoid laparoscopic peritoneal lavage for Hinchey III disease, as long-term data show higher reintervention rates (27%) compared to primary resection (7%).
  • •Manage acute diverticular hemorrhage with (EBL), which reduces rebleeding risk by over 50% compared to hemoclips (NNT = 8).
  • •Recommend long-term lifestyle modifications: high fiber intake (fruit/cereal), reduced red meat consumption (<6 servings/week), and vigorous physical activity to reduce recurrence risk by up to 50%.
  • •Avoid the routine use of for secondary prevention, as Phase 3 trials (PREVENT 1/2) demonstrated no benefit in reducing recurrence rates.
  • •Consider cyclic 400 mg BID for 7 days per month for patients with symptomatic uncomplicated diverticular disease (SUDD) to reduce chronic symptoms.

Board Review — High Yield

  • •Hinchey Stage III vs IV — Stage III is purulent peritonitis (non-communicating), Stage IV is fecal peritonitis (communicating perforation).
  • •Nuts and Seeds — Historical avoidance is unnecessary; they are not associated with increased risk of diverticulitis.
  • •Follow-up Colonoscopy — Essential 6-8 weeks post-resolution to rule out occult colorectal cancer, especially in complicated cases.
  • •Antibiotic Stewardship — The AVOD and DIABOLO trials support omitting antibiotics in uncomplicated, immunocompetent cases.
  • •Diverticular Bleeding — Most common cause of brisk hematochezia; usually painless and occurs in the absence of diverticulitis.
  • •Right-sided Diverticulitis — More common in Asian populations and younger patients; often mimics appendicitis.
  • •NSAIDs and Aspirin — Significant risk factors for both diverticulitis and diverticular hemorrhage.
  • •Hartmann's Procedure — Traditionally the standard for perforation, but primary anastomosis is now preferred in stable patients to avoid permanent stomas.

Deep Dive — Evidence Details

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