SYNTHETIC DEMONSTRATION — no real student or patient. Not a medical device.

gi-specialist

Diverticulitis Symptoms and Treatment: What to Know

Diverticulitis is inflammation — and sometimes infection — of small pouches (diverticula) in the colon wall. Classic symptoms include left lower abdominal pain, fever, and bowel habit changes. Severity ranges from mild, manageable at home with dietary modification and selective antibiotics, to serious cases requiring hospitalization or surgery.

Talk to a clinician

Nina Osei, NP — Nurse Practitioner

checkups, refills & skin. Gale can match you with a licensed clinician for a visit.

Find care →

What is the difference between diverticulosis and diverticulitis?

Diverticulosis is the presence of diverticula — small outpouchings that develop in the colon wall, typically in the sigmoid colon. It is very common, affecting more than 30% of U.S. adults between ages 50 and 59, and usually causes no symptoms. Most people with diverticulosis never develop diverticulitis 2.

Diverticulitis occurs when one or more of those pouches becomes inflamed. This can range from a localized micro-perforation that the body walls off (uncomplicated diverticulitis) to frank perforation with abscess formation or diffuse peritonitis (complicated diverticulitis) 1.

So diverticulosis is the underlying anatomical condition; diverticulitis is the acute complication. Having diverticulosis does not mean a diverticulitis episode is inevitable.

What are the symptoms of diverticulitis?

The hallmark symptom is abdominal pain — typically in the left lower quadrant, though right-sided involvement occurs and is more common in younger patients and in Asian populations 1. Other common symptoms include:

  • Fever and chills — indicating inflammatory or infectious involvement
  • Nausea and sometimes vomiting
  • Change in bowel habits — constipation, diarrhea, or alternating between the two
  • Tenderness when pressing on the lower abdomen
  • Bloating

Some people also notice blood in the stool, though significant rectal bleeding is more characteristic of diverticular bleeding (a separate complication of diverticulosis, distinct from diverticulitis).

Symptoms can develop over one to two days and may initially resemble constipation or gas pain. If pain persists or worsens, especially with fever, see a clinician promptly.

How is diverticulitis diagnosed?

Clinical assessment begins with symptoms, physical examination (tenderness and whether the abdomen is soft or rigid), and vital signs.

CT scan of the abdomen and pelvis is the standard imaging test — it confirms diverticulitis, rules out other causes of abdominal pain (appendicitis, ovarian pathology, bowel obstruction), and classifies the episode as uncomplicated or complicated (abscess, perforation, fistula) 1.

Blood tests typically include a complete blood count (looking for elevated white blood cells) and C-reactive protein (CRP). These support the diagnosis but are not specific.

Colonoscopy is not performed during an acute episode but is often recommended 6 to 8 weeks after resolution to evaluate the colon and ensure no alternative diagnosis (such as colorectal cancer) was missed 12.

How is diverticulitis treated?

Treatment depends on whether the episode is uncomplicated or complicated 1:

Uncomplicated diverticulitis (mild, no abscess or perforation) Many patients can be managed at home with: - A temporary liquid or low-fiber diet to rest the bowel - Acetaminophen for pain (NSAIDs are typically avoided) - Antibiotics — increasingly used selectively rather than routinely in otherwise healthy patients with mild episodes, based on clinical trial evidence - Close monitoring: return to the clinician or emergency room if symptoms worsen

Complicated diverticulitis - Pericolic abscess: small abscesses may resolve with IV antibiotics; larger ones require CT-guided drainage - Perforation with peritonitis: surgical emergency - Fistula: abnormal connection from the colon to the bladder, skin, or other structures — typically requires planned surgery - Obstruction: managed with surgery when severe

Hospitalization is needed when: - Oral fluids cannot be tolerated - Fever is high, pain is severe, or labs show significant infection markers - CT shows complicated disease - The patient is immunocompromised 13

What happens after a diverticulitis episode?

After recovery, your clinician will usually:

  • Recommend a follow-up colonoscopy in 6 to 8 weeks
  • Advise a gradual return to a high-fiber diet once fully recovered
  • Discuss recurrence risk — after a first uncomplicated episode managed non-surgically, the risk of a second episode exists but many people never experience recurrence 2
  • Counsel on lifestyle factors: maintaining a healthy weight, regular exercise, adequate hydration, and avoiding regular NSAID use

For people with recurrent episodes or complicated disease, referral to a colorectal surgeon to discuss elective surgery may be appropriate 1. A Gale primary care clinician can coordinate this evaluation and manage your ongoing follow-up.

Common questions

Can diverticulitis go away on its own without treatment?

Mild diverticulitis can sometimes resolve with bowel rest and dietary modification, and current evidence supports observation without antibiotics for selected patients with uncomplicated disease. However, diverticulitis should not be self-diagnosed and left completely unmonitored — it can progress to serious complications. See a clinician to confirm the diagnosis and determine whether you can be safely managed at home.

Is diverticulitis the same as appendicitis?

No. Both cause acute abdominal pain with fever, which is why CT imaging is important to distinguish them. Appendicitis pain is typically in the right lower abdomen; diverticulitis pain is more often left-sided. Appendicitis is not related to diverticula — it involves the appendix, a small structure attached to the large intestine.

Can younger people get diverticulitis?

Yes. While diverticular disease is more common with age, diverticulitis increasingly occurs in adults under 50. Younger patients are more likely to have right-sided disease and, historically, were more often treated with surgery after a first episode — though this approach has been reconsidered in recent years.

How long does it take to recover from a diverticulitis flare?

Most uncomplicated episodes managed at home resolve within 3 to 7 days with appropriate care. More severe or complicated episodes requiring hospitalization take longer. Pain during recovery should improve progressively; worsening pain or new fever after initial improvement warrants urgent follow-up.

Talk to a clinician

Nina Osei, NP — Nurse Practitioner

checkups, refills & skin. Gale can match you with a licensed clinician for a visit.

Find care →

When to seek urgent care for abdominal pain

  • —Severe abdominal pain — especially sudden onset or with a rigid, board-like belly
  • —High fever (above 38.5 °C / 101.3 °F) with abdominal pain
  • —Significant rectal bleeding
  • —Inability to keep fluids down
  • —Pain that is rapidly worsening rather than improving over hours

A rigid abdomen, severe pain, or high fever with abdominal symptoms may indicate perforation or peritonitis — a surgical emergency. Call 911 or go to the nearest emergency room immediately.

This article provides general educational information about diverticulitis. It does not replace a clinical evaluation. Gale primary care clinicians can evaluate abdominal symptoms and coordinate imaging and specialist referrals.

References

  1. 1.Qaseem A, Etxeandia-Ikobaltzeta I, Lin JS, Fitterman N, Shamliyan T, Wilt TJ (2022). Diagnosis and Management of Acute Left-Sided Colonic Diverticulitis: A Clinical Guideline From the American College of Physicians. Annals of Internal Medicine. doi:10.7326/M21-2710 ✓Symptoms, CT diagnosis, treatment algorithm including selective antibiotic use and hospitalization criteria; post-episode colonoscopy recommendation
  2. 2.National Institute of Diabetes and Digestive and Kidney Diseases (2021). Diverticular Disease. NIDDK. link ✓Prevalence of diverticulosis (>30% of adults 50-59), distinction from diverticulitis, recurrence rates, and post-episode lifestyle guidance
  3. 3.National Institute of Diabetes and Digestive and Kidney Diseases (2021). Treatment for Diverticular Disease. NIDDK. link ✓Treatment options for uncomplicated and complicated diverticulitis including hospitalization criteria and when surgery is appropriate

3 sources, numbered by first appearance. General health information, not medical advice — synthetic demonstration content.