Jejunal diverticulitis - Symptoms, Causes, Treatment & Prevention

Overview

Jejunal diverticulitis is an inflammation or infection of a diverticulum (a small outpouching) that develops in the jejunum—the middle portion of the small intestine. While diverticula are relatively common in the colon, they are far less frequent in the small bowel. When a jejunal diverticulum becomes inflamed, it can cause abdominal pain, fever, and, in severe cases, perforation or bleeding.

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• Who it affects: Most cases are diagnosed in adults over 60 years of age, with a slight male predominance (approximately 55 % men). However, jejunal diverticula can be present in younger patients, especially those with connective‑tissue disorders.
• Prevalence: Small‑bowel diverticula are identified in 0.2–4.5 % of the general population on imaging studies, but jejunal diverticulitis (the symptomatic, inflamed form) accounts for less than 0.05 % of all gastrointestinal presentations.^[1] Because many diverticula remain asymptomatic, the true prevalence may be higher.

Symptoms

Symptoms can be vague and mimic other abdominal conditions. They may appear suddenly (acute) or develop gradually (sub‑acute or chronic). Common manifestations include:

Abdominal Pain

• Location: Typically in the left upper quadrant or periumbilical area; pain may radiate to the back.
• Character: Cramping, colicky, or constant dull ache. Pain often worsens after meals (“post‑prandial pain”) because the jejunum contracts to move contents.

Gastrointestinal Symptoms

• Nausea and vomiting – especially if obstruction develops.
• A change in bowel habits – occasional diarrhea or constipation.
• Bloody or tarry stools – rare, indicating bleeding from a ulcerated diverticulum.

Systemic Signs

• Fever (≥38 °C / 100.4 °F) and chills.
• Generalized malaise, fatigue, and loss of appetite.
• Weight loss (in chronic or recurrent disease).

Complication‑Related Symptoms

• Sudden, severe abdominal pain with rigidity – suggests perforation.
• Palpable abdominal mass – may indicate an abscess.
• Signs of peritonitis (rebound tenderness, guarding).

Causes and Risk Factors

Diverticula form when the mucosal layer herniates through weak points in the muscular wall of the intestine. The exact cause of jejunal diverticulitis is not fully understood, but several factors increase the likelihood of diverticulum formation and subsequent inflammation.

Underlying Mechanisms

• Motility disorders: Abnormal intestinal motility creates high intraluminal pressure, promoting outpouching.
• Structural weakness: Age‑related degeneration of the muscular layer, or congenital connective‑tissue defects (e.g., Ehlers‑Danlos syndrome), predispose the jejunum to diverticula.
• Bacterial overgrowth: Stasis within a diverticulum can lead to bacterial proliferation, triggering inflammation.

Risk Factors

• Age > 60 years.
• Male gender (modest risk increase).
• Chronic constipation or low‑fiber diet – increases intraluminal pressure.
• Connective‑tissue disorders (Marfan, Ehlers‑Danlos).
• Previous abdominal surgery leading to adhesions.
• Use of medications that slow gut motility (opioids, anticholinergics).
• Smoking – associated with reduced mucosal blood flow.

Diagnosis

Because symptoms overlap with many other abdominal conditions, a systematic approach is essential.

Clinical Evaluation

• Detailed history (onset, character of pain, dietary habits, prior episodes).
• Physical examination focusing on tenderness, guarding, and signs of peritonitis.

Laboratory Tests

• Complete blood count – leukocytosis is common.
• C‑reactive protein (CRP) and erythrocyte sedimentation rate (ESR) – markers of inflammation.
• Electrolytes and renal function – important if vomiting or dehydration is present.
• Liver function tests – to rule out hepatobiliary causes.

Imaging Studies

• CT abdomen and pelvis with IV contrast: The gold‑standard; shows a focal outpouching with wall thickening, peri‑diverticular fat stranding, or an abscess. Sensitivity > 90 % for diverticulitis.^[2]
• CT enterography: Provides detailed small‑bowel images; useful when standard CT is inconclusive.
• Magnetic Resonance Enterography (MRE):** An alternative for patients with iodine allergy or renal insufficiency.
• Upper gastrointestinal (GI) series with small‑bowel follow‑through: May demonstrate diverticula but less sensitive for inflammation.
• Endoscopy: Upper endoscopy (EGD) rarely visualizes jejunal diverticula but can exclude other pathologies; capsule endoscopy is generally avoided during acute inflammation due to risk of retention.

Diagnostic Criteria (Simplified)

1. Compatible clinical picture (abdominal pain, fever, leukocytosis).
2. Imaging demonstrating a jejunal diverticulum with surrounding inflammatory changes.
3. Exclusion of other causes (e.g., appendicitis, pancreatitis, Crohn’s disease).

Treatment Options

Management depends on severity, presence of complications, and the patient’s overall health.

Medical Management (Uncomplicated Disease)

• Antibiotics: Broad‑spectrum coverage targeting Gram‑negative rods and anaerobes (e.g., ceftriaxone + metronidazole, or a single‑agent such as piperacillin‑tazobactam). Typical course: 7–10 days.^[3]
• Fluid resuscitation: IV crystalloids to correct dehydration.
• Analgesia: Acetaminophen or short‑acting opioids if needed; avoid NSAIDs as they can increase bleeding risk.
• Bowel rest: Nil per os (NPO) for 24–48 h, then gradual re‑introduction of a low‑residue diet.

Surgical Intervention (Complicated Disease)

Surgery is indicated for perforation, uncontrolled sepsis, abscess not amenable to percutaneous drainage, obstruction, or repeated episodes.

• Resection of the affected segment: Segmental jejunal resection with primary anastomosis is the most common procedure.
• Laparoscopic approach: Feasible in stable patients; offers shorter hospital stay.
• Percutaneous drainage: Image‑guided drainage of a localized abscess may avoid surgery in selected cases.
• Post‑operative antibiotics for 5–7 days and monitoring for anastomotic leak.

Adjunctive & Lifestyle Measures

• High‑fiber diet (25–30 g/day) after the acute episode resolves – helps prevent constipation and reduces intraluminal pressure.
• Regular aerobic activity (≥150 min/week) to promote gut motility.
• Smoking cessation and moderation of alcohol intake.
• Review of medications that slow gut transit; consider tapering or substitution when possible.

Living with Jejunal Diverticulitis

Even after recovery, patients may experience recurrent discomfort. Practical strategies help maintain quality of life.

Dietary Tips

• Consume a balanced diet rich in soluble and insoluble fiber—whole grains, legumes, fruits, and vegetables.
• Stay well‑hydrated (≥2 L water per day) to aid fiber function.
• Avoid large, heavy meals that can overstretch the jejunum; aim for 5–6 small meals per day.
• Limit foods that irritate the gut—spicy foods, excessive caffeine, and fatty fried items.
• Consider a low‑FODMAP trial if you have concurrent irritable bowel symptoms.

Medication Management

• Keep a medication list; discuss any new drug with your gastroenterologist.
• If pain recurs, use acetaminophen first; reserve NSAIDs for short courses under supervision.
• Probiotics (e.g., Lactobacillus rhamnosus) may help restore normal flora after antibiotics—though data are limited.

Monitoring & Follow‑up

• Schedule a gastroenterology visit 4–6 weeks after an acute episode to assess healing.
• Annual physical exam with CBC and CRP if you have had multiple recurrences.
• Promptly report new or worsening abdominal pain, fever, or changes in stool.

Activity Recommendations

• Light activity (walking, stretching) within 24 h of symptom resolution is encouraged.
• Avoid heavy lifting or intense exercise for at least 2 weeks after surgery.

Prevention

Because many jejunal diverticula are congenital or age‑related, the goal is to prevent inflammation and complications.

• High‑fiber diet: Regular fiber intake reduces stool transit time and pressure.
• Stay active: Exercise improves gut motility.
• Hydration: Adequate fluids keep stool soft.
• Medication review: Discuss with your provider any drugs that slow bowel movements.
• Smoking cessation: Improves mucosal blood flow and overall gut health.
• Routine medical care: Managing chronic conditions such as diabetes and connective‑tissue disorders can lower risk.

Complications

If left untreated, jejunal diverticulitis can lead to serious, potentially life‑threatening conditions.

• Perforation: Free air in the abdomen → peritonitis; mortality up to 30 % in elderly patients.
• Abscess formation: Localized collection of pus; may require drainage.
• Intestinal obstruction: Inflammation or adhesions block the lumen.
• Bleeding: Erosion of a diverticular wall can cause acute GI hemorrhage.
• Fistula formation: Rarely, a diverticulum can erode into adjacent structures (e.g., the pancreas or colon).
• Sepsis: Bacterial translocation from an inflamed diverticulum can precipitate systemic infection.

When to Seek Emergency Care

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References

1. Grasberger, J., et al. “Small bowel diverticulosis: a review of the literature.” World Journal of Gastroenterology, vol. 15, no. 31, 2009, pp. 3789‑3795.
2. Yamashita, H., et al. “CT findings of jejunal diverticulitis.” Radiology, vol. 265, no. 2, 2012, pp. 598‑603.
3. American College of Gastroenterology. “Management of diverticulitis.” Guidelines, 2023.
4. Mayo Clinic. “Diverticulitis.” Updated 2024.
5. CDC. “Antibiotic prescribing for intra‑abdominal infections.” 2022.