Sigmoid Diverticulitis Symptoms
Sigmoid diverticulitis most commonly presents with acute or subacute left lower quadrant abdominal pain, often accompanied by fever, altered bowel habits, and elevated inflammatory markers (white blood cell count and/or C-reactive protein). 1
Primary Clinical Presentation
The hallmark symptom is left lower quadrant abdominal pain that develops acutely or subacutely. However, clinical presentation alone is correct in only 40-65% of cases, making imaging essential for confirmation 1. The pain typically:
- Localizes to the left lower abdomen (though the sigmoid loop's variable position can occasionally cause right-sided symptoms 2)
- Develops gradually in uncomplicated cases
- Presents dramatically with acute onset in complicated disease 3
Associated Symptoms and Signs
Common accompanying features include:
- Fever - typically develops within hours in acute complicated disease 3
- Change in bowel habits - constipation or diarrhea 1
- Nausea without vomiting 1
- Mild to moderate abdominal tenderness on examination 4
Laboratory findings:
- Elevated white blood cell count
- Elevated C-reactive protein (CRP) 1
Important Clinical Caveats
These symptoms are not specific for diverticulitis - clinical suspicion alone is accurate in less than two-thirds of patients 1. CT imaging with oral and intravenous contrast achieves 95% sensitivity and specificity for diagnosis and should be considered to confirm the diagnosis, especially in patients without prior imaging-confirmed diverticulitis 4, 1.
Complicated vs. Uncomplicated Presentations
Uncomplicated diverticulitis (88% of cases):
- Gradually increasing left lower quadrant symptoms
- Manageable pain
- Stable vital signs
- Able to tolerate oral intake 4
Complicated diverticulitis (12% of cases):
- Dramatic acute onset of severe abdominal pain
- Signs of perforation, peritonitis, obstruction, or abscess
- Systemic inflammatory response
- Symptom duration >5 days before presentation increases risk of progression 4, 1
Atypical Presentations
Rare manifestations to consider:
- Fistula formation - sigmoid-vesical fistulas may present with pneumaturia, fecaluria, or recurrent urinary tract infections rather than typical abdominal pain 5
- Smoldering diverticulitis (5% of cases) - persistent abdominal pain with continued CT evidence of inflammation after acute episode 1
- Right-sided pain from giant sigmoid diverticula due to variable sigmoid positioning 2
Clinicians should maintain high suspicion for imaging when patients present with predictors of complicated disease: symptom duration >5 days, signs of perforation/bleeding/obstruction/abscess, immunocompromised status, or failure to improve with initial therapy 4, 1.