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Diverticulosis and diverticulitis
Information for patients from the Colorectal Surgery Department, William
Harvey Hospital Ashford
What is it?
Many people have small pouches in their colons that bulge outwards through weak spots, similar
to an inner tube that pokes through weak places in a tire. Each pouch is called a diverticulum.
Pouches (plural) are called diverticula.
The condition of having diverticula is called diverticulosis. About 10 percent of people over the age
of 40 have diverticulosis. The condition becomes more common as people age. About half of all
people over the age of 60 have diverticulosis and 80 percent of people over the age of 80 have
this condition.
When the pouches become infected or inflamed, the condition is called Diverticulitis. This occurs
in 10 or 25 percent of people with diverticulosis. Diverticulosis and diverticulitis are also known as
diverticular disease.
What causes diverticular disease?
Although not proven, the commonly held view is that a low-fibre diet is the main cause of
diverticular disease. Many processed foods contain refined, low-fibre flour. Unlike whole-wheat
flour, refined flour has no wheat bran.
Diverticular disease is common in developed or industrialised countries - particularly the United
States, England, and Australia - where low-fibre diets are common. The disease is rare in the
countries of Asia and Africa, where people eat high-fibre vegetable diets.
Fibre is the part of fruits, vegetables, and grains that the body cannot digest. Some fibre dissolves
easily in water (soluble fibre). It takes on a soft, jelly-like texture in the intestines. Some fibre
passes almost unchanged through the intestines (insoluble fibre). Both kinds of fibre help make
stools soft and easy to pass. Fibre also prevents constipation.
What are the symptoms?
Diverticulosis
Most people with diverticulosis do not have any discomfort or symptoms. However, possible
symptoms may include mild cramps, bloating, and constipation. Other diseases such as irritable
bowel syndrome (IBS) and stomach ulcers cause similar problems, so these symptoms do not
always mean a person has diverticulosis. You should visit your doctor if you have these symptoms.
Diverticulitis
The most common symptoms of diverticulitis is abdominal pain. The most common sign is
tenderness around the left side of the lower abdomen. If infection is the cause, fever, nausea,
vomiting, chills, cramping, and constipation may occur as well. The severity of symptoms depends
on the extent of the infection and complications.
What are the complications?
Diverticulitis can lead to bleeding, infections, perforations, tears, or blockages. These
complications always require treatment to prevent them from progressing and causing serious
illness.
Bleeding
Bleeding from diverticula is a rare complication. When diverticula bleed, blood may appear in the
toilet or in your stool. Bleeding can be severe, but it may stop by itself and not require treatment.
Bleeding diverticula are caused by a small blood vessel in a diverticulum that weakens and finally
bursts. If you have bleeding from the rectum, you should see your doctor. If the bleeding does not
stop, surgery may be necessary.
Abscess, perforation, and peritonitis
The infection causing diverticulitis often clears up after a few days of treatment with antibiotics. If
the condition gets worse, an abscess may form in the colon. An abscess is an infected area with
pus that may cause swelling and destroy tissue. Sometimes the infected diverticula may develop
small holes, called perforations. These perforations allow pus to leak out of the colon into the
abdominal area. If the abscess is small and remains in the colon, it may clear up after treatment
with antibiotics, the doctor may need to drain it.
To drain the abscess, the doctor uses a needle and a small tube called a catheter. The doctor
inserts the needle through the skin under a local anaesthetic and drains the fluid through the
catheter. This procedure is called percutaneous catheter drainage. Sometimes surgery is needed
to clear the abscess and, if necessary, remove part of the colon.
A large abscess can become a serious problem if the infection leaks out and contaminates areas
outside the colon. Infections that spread into the abdominal cavity are called peritonitis. Peritonitis
requires immedaite surgery to clean the abdominal cavity and to remove the damaged part of the
colon. Without surgery, peritonitis can be fatal.
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Fistula
A fistula is an abnormal connection of tissue between two organs or between an organ and the
skin. When damaged tissues come into contact with one another during infection, they sometimes
stick together. If they heal that way, a fistula forms. When diverticulitis-related infections spread
outside the colon, the colon tissue may stick to other nearby tissues. The organs usually involved
are the bladder, small intestine, and skin.
The most common type of fistula occurs between the bladder and the colon. It affects men more
than women. This type of fistula can result in a severe, long-lasting infection of the urinary tract.
The problem can be corrected with surgery to remove the fistula and the affected part of the colon.
Intestinal obstruction
The scarring caused by infection may cause partial or total blockage of the large intestine. When
this happens, the colon is unable to move bowel contents normally. When the obstruction totally
blocks the intestine, emergency surgery is necessary. Partial blockage is not an emergency, so the
surgery to correct it can be planned.
How does the doctor diagnose diverticular disease?
To diagnose diverticular disease, the doctor will ask about the medical history, perform a physical
examination, and may perform one or more diagnostic tests. As most people do not have
symptoms, diverticulosis is often found through tests ordered for another ailment. When taking a
medical history, the doctor may ask about bowel habits, symptoms, pain, diet, and medications.
The physical examination usually involves a digital rectal examination. To perform this test, the
doctor inserts a gloved, lubricated finger into the rectum to detect tenderness, blockage, or blood.
The doctor may check stools for signs of bleeding and test blood for signs of infection. The doctor
may also order x-rays or other tests.
What is the treatment for diverticula disease?
A high-fibre diet and occasionally, mild pain medications will help relieve symptoms in most cases.
Sometimes an attack of diverticulitis is serious enough to require a hospital stay and possibly
surgery.
Diverticulosis
Increasing the amount of fibre in the diet may reduce symptoms of diverticulosis and prevent
complications such as diverticulitis. Fibre keeps stools soft and lowers pressure inside the colon
so that bowel content can move through easily. Twenty to 35 grams of fibre is recommended daily.
The table on the next page shows the amount of fibre in some foods that you can easily add to
your diet.
The doctor may also recommend taking a fibre product such as Fybogel once a day. These
products are mixed with water and provide about two to 3.5 grams per tablespoon, mixed with
eight ounces of water. Fybogel and Psyllium seed products are available in pharmacies.
Until recently, many doctors suggested avoiding foods with small seeds such as tomatoes
or strawberries because they believed that particles could lodge in the diverticula and cause
inflammation. However, it is now generally accepted that only foods that may irritate or get caught
in the diverticula cause problems. Foods such as nuts, popcorn hulls, and sunflower, pumpkin,
caraway, and sesame seeds should be avoided. The seeds in tomatoes, courgettes, cucumbers,
strawberries, and raspberries, as well as poppy seeds, are generally considered harmless. People
differ in the amounts and types of foods they can eat. Decisions about diet should be made based
on what works best for each person. Keeping a diary may help identify individual items in the diet.
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If cramps, bloating, and constipation are problems, the doctor may prescribe a short course of pain
medication. However, many medications affect emptying of the colon, an undesirable side effect
for people with diverticulosis.
Amount of fibre in some foods
Breakfast cereals
All-Bran
Shredded Wheat
Bran Flakes
Weetabix
Muesli (no added sugar)
Muesli (swiss style)
Fruit ‘n’ Fibre
Porridge (milk or water)
Cornflakes
Typical portion (weight)
1 medium sized bowl (40g)
2 pieces (44g)
1 medium sized bowl (30g)
2 pieces (37.5g)
1 medium sized bowl (45g)
1 medium sized bowl (45g)
1 medium sized bowl (40g)
1 medium sized bowl (250g)
1 medium sized bowl (30g)
Fibre/portion
9.8grams
4.3grams
3.9grams
3.6grams
3.4grams
2.9grams
2.8grams
2.3grams
0.3grams
Bread/rice/pasta
Crispbread (rye)
Pitta bread (wholemeal)
Pasta (plain, fresh cooked)
Wholemeal bread
Naan bread
Brown bread
Granary bread
Brown rice (boiled)
White bread
White rice (boiled)
Typical portion (weight)
4 crispbread (36g)
1 piece (75g)
1 medium portion (200g)
2 slices (70g)
1 piece (160g)
2 slices (70g)
2 slices (70g)
1 medium portion (200g)
2 slices (70g)
1 medium portion (200g)
Fibre/portion
4.2grams
3.9grams
3.8grams
3.5grams
3.2grams
2.5grams
2.3grams
1.6grams
1.3grams
0.2grams
Vegetable
Baked beans
Red kidney beans
Peas (boiled)
French beans (boiled)
Brussel sprouts (boiled)
Potatoes (old, boiled)
Spring greens (boiled)
Carrots (boiled/sliced)
Broccoli (boiled)
Spinach (boiled)
Typical portion (weight)
Half can (200g)
3 tablespoons (80g)
3 heaped tablespoons (80g)
4 heaped tablespoons (80g)
8 sprouts (80g)
1 medium size (200g)
4 heaped tablespoons (80g)
3 heaped tablespoons (80g)
2 spears (80g)
2 heaped tablespoons (80g)
Fibre/portion
7.4grams
5.4grams
3.6grams
3.3grams
2.5grams
2.4grams
2.1grams
2.0grams
1.8grams
1.7grams
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Salad vegetables
Pepper (capsicum green/red)
Onions (raw)
Olives (in brine)
Tomato (raw)
Lettuce (sliced)
Typical portion (weight)
Half (80g)
1 medium (80g)
1 heaped tablespoon (30g)
1 medium / 7 cherry (80g)
1 bowl (80g)
Fibre/portion
1.3grams
1.1grams
0.9grams
0.8grams
0.7grams
Fruit
Avocado pear
Pear (with skin)
Orange
Apple (with skin)
Raspberries
Banana
Tomato juice
Strawberries
Grapes
Orange juice
Typical portion (weight)
1 medium (145g)
1 medium (170g)
1 medium (160g)
1 medium (112g)
2 handfuls (80g)
1 medium (150g)
1 small glass (200ml)
7 strawberries (80g)
1 handful (80g)
1 small glass (200ml)
Fibre/portion
4.9grams
3.7grams
2.7grams
2.0grams
2.0grams
1.7grams
1.2grams
0.9grams
0.6grams
0.2grams
Dried fruit/nuts
Apricots (semi-dried)
Prunes (semi-dried)
Almonds
Peanuts (plain)
Mixed nuts
Brazil nuts
Raisins/sultanas
Typical portion (weight)
3 whole (80g)
3 whole (80g)
20 nuts (33g)
1 tablespoon (25g)
1 tablespoon (25g)
10 nuts (33g)
1 tablespoon (25g)
Fibre/portion
5.0grams
4.6grams
2.4grams
1.6grams
1.5grams
1.4grams
0.5grams
Other food
Quorn (pieces)
Chicken curry (takeaway)
Vegetable pasty
Bran (wheat)
Potato crisps (low fat)
Pakora/bhajia (vegetable)
Pizza (cheese and tomato)
Typical portion (weight)
1 serving (100g)
1 portion meat/sauce (150g)
1 medium sized (150g)
1 tablespoon (7g)
1 bag (35g)
1 portion (50g)
1 slice, deep pan (80g)
Fibre/portion
4.8grams
3.0grams
3.0grams
2.5grams
2.1grams
1.8grams
1.8grams
Diverticulitis
Treatment for diverticulitis focuses on clearing up the infection and inflammation, resting the colon,
and preventing or minimising complications. An attack of diverticulitis without complications may
respond to antibiotics within a few days if treated early enough. To help the colon rest, the doctor
may recommend bed rest and a liquid diet, along with pain relief.
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When is surgery necessary?
If attacks are severe or frequent, the doctor may advise surgery. The surgeon removes the
affected part of the colon and joins the remaining sections. This type of surgery is called colon
resection, and aims to keep attacks from coming back and prevents complications. The doctor
may also recommend surgery for complications of a fistula or intestinal obstruction.
If antibiotics do not correct an attack, emergency surgery may be required. Other reasons for
emergency surgery include a large abscess, perforation, peritonitis, or continued bleeding.
Emergency surgery usually involves two operations. The first surgery will clear the infected
abdominal cavity and remove part of the colon. Because of infection and sometimes obstruction, it
is not safe to rejoin the colon during the first operation. Instead, the surgeon creates a temporary
hole, or stoma, in the abdomen. The end of the colon is connected to the hole, a procedure called
colostomy, to allow normal eating and bowel movements. The stool goes into a bag attached to
the opening in the abdomen. In the second operation, the surgeon rejoins the ends of the colon.
Points to remember
• Diverticulosis occurs when small pouches, called diverticula, bulge outward through weak spots
in the colon (large intestine).
• The pouches form when pressure inside the colon builds, usually because of constipation.
• Most people with diverticulosis never have any discomfort or symptoms.
• The most likely cause of diverticulosis is a low fibre diet because it increases the likelihood of
constipation and pressure inside the colon.
• For most people with diverticulosis, eating a high-fibre diet is the only treatment required.
• You can increase your fibre intake by eating foods such as whole grain breads and cereals; fruit
like apples and peaches; vegetables like kidney beans and lima beans.
• Diverticulitis occurs when the pouches become infected or inflamed and cause pain and
tenderness around the left side of the lower abdomen.
Additional readings
• Diverticular disease. In: Corman ML, Allison SI, Kuehne JP. Handbook of colon and rectal
surgery. Hagerstown, MD: Lippincott, Williams and Wilkins. 2002; 637-653.
• Diverticular disease. In: King JE, ed. Mayo Clinic on Digestive Health. Rochester, MN: Mayo
Clinic. 2000; 125-132.
• Marcello PW. Understanding diverticular disease. Ostomy Quarterly. 2002: 39(2); 56-57.
• http://www.nlm.nih.gov/medlineplus/diverticulosisanddiverticulitis.html
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Any complaints, comments, concerns, or compliments
If you have other concerns please talk to your doctor or nurse. Alternatively please contact our
Patient Advice and Liaison Service (PALS) on 01227 783145 or 01227 864314,
or email [email protected]
Further patient information leaflets
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covering conditions, services, and clinical procedures carried out by the Trust. For a full listing
please go to www.ekhuft.nhs.uk/patientinformation or contact a member of staff.
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This leaflet has been produced with and for patients
Information produced by Mr Nagesh Rao, Colo-rectal surgeon and team
Date reviewed: March 2015 Next review date: March 2017
EKH104