Diverticulitis
Sources consulted
This article is original patient-education content.
- WHO—Health topics A–Z(2024)
- NHS—Health A to Z(2024)
- CDC—Health topics(2024)
Based on international clinical guidelines
Overview
Diverticulitis is a condition where small pouches, called diverticula, that form in the lining of your large intestine (colon) become inflamed or infected. This can cause belly pain, fever, and changes in your bowel habits.
Key facts
- Diverticula are common, especially after age 40, but most people never have any problems from them.
- When these pouches become inflamed or infected, it is called diverticulitis.
- Diverticulitis can usually be treated with rest, changes in diet, and sometimes medication, but severe cases may need hospital care.
Yes, diverticulitis is fairly common, especially in people over 60. About half of people over age 60 have diverticula, and around 10 to 25 percent of them will develop diverticulitis at some point.
Diverticulitis most often affects people over 40, but it can occur at any age. It is more common in people who eat a low-fiber diet, are overweight, smoke, or do not get enough exercise.
Symptoms
- Severe belly pain that comes on suddenly and does not go away
- A very high fever (over 101°F or 38.3°C) that does not come down
- Being unable to pass gas or have a bowel movement
- A hard, swollen belly that is tender to touch
- Vomiting blood or having blood in your stool
- ⚠Persistent belly pain that gets worse over a day or two
- ⚠Blood in your stool (dark or bright red)
- ⚠A fever that keeps coming back
- ⚠Nausea or vomiting that prevents you from keeping fluids down
Common symptoms
- Sudden pain, usually on the lower left side of your belly (though some people feel it on the right side)
- Fever and chills
- Nausea and vomiting
- Constipation or diarrhea
- Bloating or feeling very full
Symptoms in children
- Diverticulitis is rare in children. When it does happen, symptoms are similar to adults: belly pain, fever, and changes in bowel habits.
Symptoms in older adults
- Older adults may have less obvious pain but might feel confused, weak, or have a higher fever.
- They may also experience constipation or diarrhea without much pain.
Causes
Main causes
- The exact cause is not fully understood, but diverticulitis happens when small pouches (diverticula) in the colon become blocked, often by stool, and then get inflamed or infected.
- A low-fiber diet is thought to contribute because it can lead to constipation, which puts pressure on the colon wall and may cause pouches to form.
Risk factors
- Age over 40
- Being overweight or obese
- Smoking
- Not getting enough physical activity
- Eating a diet low in fiber and high in red meat and processed foods
- Taking certain medications such as non-steroidal anti-inflammatory drugs (NSAIDs) or steroids (these are general classes, not brand names)
- Having a family history of diverticulitis
When to see a doctor
See a doctor urgently if:
- Severe belly pain that comes on suddenly
- A fever over 100.4°F (38°C) with belly pain
- Vomiting that does not stop
- Signs of dehydration (dry mouth, dark urine, dizziness)
Book a routine appointment if:
- Mild belly pain that lasts more than a few days
- Changes in bowel habits that persist (constipation or diarrhea)
- Bloating or discomfort after eating
Diagnosis
Your healthcare provider will ask about your symptoms and do a physical exam, pressing gently on your belly. They may also order tests to confirm the diagnosis and rule out other conditions.
Tests that may be done
- Blood tests to check for signs of infection (like a high white blood cell count)
- CT scan (computed tomography) of your belly – this is the most common and accurate test for diverticulitis
- Sometimes an ultrasound or MRI if CT is not suitable
What to expect at your appointment
If your doctor suspects diverticulitis, they may start treatment without doing a CT scan if your symptoms are mild. If tests are needed, they are usually done at a hospital or imaging center. The process is straightforward and not painful.
Treatment
Treatment for diverticulitis depends on how severe your symptoms are. Most cases can be managed at home with rest, changes in diet, and sometimes medication. More serious cases may require a hospital stay.
Self-care at home
- Rest your bowels by sticking to clear liquids (water, clear broth, clear juice) for a day or two to give your colon a break.
- Once you feel better, slowly add low-fiber foods (like white bread, rice, and cooked vegetables) for a few days, then gradually increase fiber.
- Drink plenty of water to stay hydrated.
- Apply a warm compress or hot water bottle to your belly to ease pain (but not if you have a fever).
Medical treatments
Your healthcare provider may recommend antibiotics if there is an infection. They are usually taken by mouth for about 7 to 10 days. For more severe cases, antibiotics may be given through a drip in a hospital. Sometimes pain relievers are used, but avoid non-steroidal anti-inflammatory drugs (like ibuprofen) because they can increase the risk of bleeding. Always follow your doctor's advice.
When is surgery considered?
Surgery is usually only needed if you have complications such as an abscess (a pocket of pus), a perforation (a hole in the colon), or fistula (an abnormal connection between organs). It may also be considered if you have many severe attacks that do not get better with treatment.
Living with this condition
After a diverticulitis attack, most people can return to normal activities within a week or two. You will need to gradually increase your fiber intake and drink plenty of fluids to keep your bowel movements soft and regular. Avoid straining during bowel movements.
Lifestyle tips
- Eat a high-fiber diet with plenty of fruits, vegetables, whole grains, and legumes.
- Drink at least 8 glasses of water each day.
- Get regular exercise, like walking, to help keep your bowels moving.
- If you smoke, try to quit – smoking increases your risk of attacks.
- Maintain a healthy weight.
Diet and exercise
A healthy diet and regular exercise are key to managing diverticulitis and reducing the risk of future attacks. Aim for at least 30 minutes of moderate activity most days. Discuss any dietary changes with your healthcare provider, especially if you have other medical conditions.
Mental health and emotional wellbeing
Living with diverticulitis can be stressful and worrying, especially if you have had severe attacks. You may feel anxious about future flare-ups or changes in your diet. It is normal to have these feelings. Talk to your healthcare provider or a counselor if stress or anxiety affects your daily life.
Prevention
While there is no sure way to prevent diverticulitis, a high-fiber diet, regular exercise, and staying at a healthy weight may lower your risk. Avoiding smoking and limiting red meat may also help.
Complications
If left untreated
- Abscess – a pocket of pus that forms near the colon, which may need to be drained.
- Perforation – a hole in the colon that can lead to a serious infection in the belly (peritonitis).
- Fistula – an abnormal tunnel that forms between the colon and another organ, like the bladder.
- Bowel obstruction – a blockage that prevents stool from passing.
Long-term outlook
Most people with diverticulitis recover fully with treatment. Complications are not common, and when they do happen, they can usually be treated effectively. With proper care and lifestyle changes, many people have no further problems. Your healthcare team will help you manage the condition and reduce the risk of recurrence.
Find support
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Local organisations
- NHS (National Health Service) ↗ · United Kingdom
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Always verify with your doctor
Health guidelines vary by country and region. The information in this article is based on international clinical guidelines but may not reflect the specific guidelines, medications, or practices in your country. Always discuss your health concerns with your own doctor or healthcare provider, and refer to your local national health guidelines where available.
Important notice This information is for educational purposes only. It does not replace professional medical advice, diagnosis, or treatment. Always consult a qualified healthcare provider about your specific situation. If you are experiencing a medical emergency, call your local emergency services immediately.