A-Z Health Advice

Diverticular disease and diverticulitis


Diverticular disease and diverticulitis are related digestive conditions that affect the large intestine (bowel).

Diverticula are small bulges or pockets that can develop in the lining of the intestine as you get older.

Most people with diverticula don't get any symptoms and only know they have them after having a scan for another reason.

When diverticula cause symptoms, such as pain in the lower tummy, it's called diverticular disease.

If the diverticula become inflamed or infected, causing more severe symptoms, it's called diverticulitis. You're more likely to get diverticular disease and diverticulitis if you don't get enough fibre in your diet.

This page covers:


When to get medical advice




More information and support

Symptoms of diverticular disease and diverticulitis

Symptoms of diverticular disease include:

  • tummy pain, usually in your lower left side, that tends to come and go and gets worse during or shortly after eating (emptying your bowels or passing wind eases it)
  • feeling bloated
  • constipation, diarrhoea or both
  • occasionally, mucus in your poo

If your diverticula become infected and inflamed (diverticulitis), you may suddenly:

  • get constant, more severe tummy pain
  • have a high temperature of 38C or above
  • feel sick or vomit
  • feel generally tired and unwell
  • get blood in your poo or bleeding from your bottom (rectal bleeding

When to get medical advice

Contact your GP as soon as possible if you have symptoms of diverticular disease or diverticulitis.

If you've already been diagnosed with diverticular disease, you usually don't need to contact your GP – the symptoms can be treated at home.

But if you have any bleeding or severe pain, seek immediate medical advice. Contact your GP or, if this is not possible, call NHS 111 or your local out-of-hours service.

Tests for diverticular disease and diverticulitis

After taking your medical history and listening to your symptoms, your GP may first want to rule out other conditions, such as irritable bowel syndrome (IBS), coeliac disease or bowel cancer. These often have very similar symptoms to diverticular disease.

This may involve blood tests. If necessary, you'll be referred for a colonoscopy, a CT scan or sometimes both.


A colonoscopy is where a thin tube with a camera at the end (a colonoscope) is inserted into your back passage and guided up into your bowel. The doctor will then look for any diverticula or signs of diverticulitis. You will be given a laxative beforehand to clear out your bowels.

A colonoscopy shouldn't be painful but can feel uncomfortable. You may be offered painkilling medication and a sedative to make you feel more relaxed and reduce any discomfort.

Watch a video on what happens during a colonoscopy.

CT scan

Sometimes, you may need to have a CT scan. This might be done instead of a colonoscopy or in combination with one (called a CT colonoscopy or virtual colonoscopy). For a CT colonoscopy, the scan is done after you've had the laxative.

Treatment for diverticular disease and diverticulitis


Eating a high-fibre diet may help ease the symptoms of diverticular disease and prevent diverticulitis. Generally, adults should aim to eat 30g of fibre a day, but your GP will be able to give you a specific target based on your individual height and weight.

Good sources of fibre include fresh and dried fruits and vegetables, beans and pulses, nuts, cereals and starchy foods. Fibre supplements – usually in the form of sachets of powder that you mix with water – are also available from pharmacists and health food shops.

Find out how to get more fibre in your diet.

Gradually increasing your fibre intake over a few weeks and drinking plenty of fluids can help prevent side effects associated with a high-fibre diet, such as bloating and wind.

If you have diverticulitis, your GP may recommend that you stick to a fluid-only diet for a few days until your symptoms improve.

While you are recovering you should eat a very low-fibre diet to rest your digestive system. Once the symptoms have gone, you can return to your high-fibre diet.


Paracetamol can be used to relieve pain – aspirin or ibuprofen shouldn't be taken regularly as they can cause stomach upsets. Speak to your GP if paracetamol alone is not working.

You may be prescribed a bulk-forming laxative to help ease any constipation or diarrhoea.

Diverticulitis can usually be treated at home with antibiotics prescribed by your GP.

However, more serious cases of diverticulitis may need hospital treatment. In hospital, you will probably get injections of antibiotics, and be kept hydrated and nourished using a tube directly connected to your vein (intravenous drip). You may also be prescribed a stronger painkiller if paracetamol is not helping.


In rare cases, surgery may be needed to treat serious complications of diverticulitis.

Surgery usually involves removing the affected section of your large intestine. This is known as a colectomy. This is the treatment for rare complications such as fistulas, peritonitis or a blockage in your intestines.

After a colectomy, you may have a temporary or permanent colostomy, where one end of your bowel is diverted through an opening in your tummy.

The most common complication of diverticulitis is developing abscesses. These are usually treated with a technique known as percutaneous drainage, which is done by a radiologist.

If surgery is being considered, your doctor should discuss the benefits and the risks very carefully with you.


It's not known exactly why some people get diverticular disease, but it seems to be linked to age, diet and lifestyle, and genetics.


As you get older, the walls of your large intestine become weaker and the pressure of hard stools passing through your intestines can cause diverticula to form.

The majority of people will have some diverticula by the time they are 80 years old.

Diet and lifestyle

Not eating enough fibre is thought to be linked to developing diverticular disease and diverticulitis.

Fibre helps to make your stools softer and larger, so they put less pressure on the walls of your intestines.

Some other things that seem to increase your risk include:

  • smoking
  • being overweight or obese
  • having a history of constipation
  • long-term regular use of painkillers such as ibuprofen or aspirin


You're more likely to develop diverticula if you have a close relative with diverticular disease, especially if they developed it before they were 50.

More information and support

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