Ulcerative colitis
Definition
:

Ulcerative colitis (UL-sur-uh-tiv koe-LIE-tis) is an inflammatory bowel
disease (IBD) that causes long-lasting inflammation in part of your
digestive tract.
Like Crohn's disease, another common IBD, ulcerative colitis can be
debilitating and sometimes can lead to life-threatening complications.
Because ulcerative colitis is a chronic condition, symptoms usually
develop over time, rather than suddenly.
Ulcerative colitis usually affects only the innermost lining of your
large intestine (colon) and rectum. It occurs only through continuous
stretches of your colon, unlike Crohn's disease, which occurs anywhere
in the digestive tract and often spreads deeply into the affected
tissues.
There's no known cure for ulcerative colitis, but therapies are
available that may dramatically reduce the signs and symptoms of
ulcerative colitis and even bring about a long-term remission.
Symptoms:
Ulcerative colitis symptoms can vary, depending on the severity of
inflammation and where it occurs. For these reasons, doctors often
classify ulcerative colitis according to its location.
Here are the signs and symptoms that may accompany ulcerative colitis, depending on its classification:
- Ulcerative proctitis. In this form of ulcerative
colitis, inflammation is confined to the area closest to the anus
(rectum), and for some people, rectal bleeding may be the only sign of
the disease. Others may have rectal pain and a feeling of urgency. This
form of ulcerative colitis tends to be the mildest.
- Proctosigmoiditis. This form involves the rectum
and the lower end of the colon, known as the sigmoid colon. Bloody
diarrhea, abdominal cramps and pain, and an inability to move the bowels
in spite of the urge to do so (tenesmus) are common problems associated
with this form of the disease.
- Left-sided colitis. As the name suggests,
inflammation extends from the rectum up through the sigmoid and
descending colon, which are located in the upper left part of the
abdomen. Signs and symptoms include bloody diarrhea, abdominal cramping
and pain on the left side, and unintended weight loss.
- Pancolitis. Affecting more than the left colon and
often the entire colon, pancolitis causes bouts of bloody diarrhea that
may be severe, abdominal cramps and pain, fatigue, and significant
weight loss.
- Fulminant colitis. This rare, life-threatening form
of colitis affects the entire colon and causes severe pain, profuse
diarrhea and, sometimes, dehydration and shock. People with fulminant
colitis are at risk of serious complications, including colon rupture
and toxic megacolon, a condition that causes the colon to rapidly
expand.
The course of ulcerative colitis varies, with periods of acute illness
often alternating with periods of remission. But over time, the severity
of the disease usually remains the same. Most people with a milder
condition, such as ulcerative proctitis, won't go on to develop
more-severe signs and symptoms.
When to see a doctor
See your doctor if you experience a persistent change in your bowel
habits or if you have any of the signs and symptoms of ulcerative
colitis, such as:
- Abdominal pain
- Blood in your stool
- Ongoing bouts of diarrhea that don't respond to over-the-counter (OTC) medications
- An unexplained fever lasting more than a day or two
Although ulcerative colitis usually isn't fatal, it's a serious disease
that, in some cases, may cause life-threatening complications.
Causes:
Like Crohn's disease, ulcerative colitis causes inflammation and ulcers
in your intestine. But unlike Crohn's, which can affect the colon in
various, separate sections, ulcerative colitis usually affects one
continuous section of the inner lining of the colon beginning with the
rectum.
No one is quite sure what triggers ulcerative colitis, but there's a
consensus as to what doesn't. Researchers no longer believe that stress
is the main cause, although stress can often aggravate symptoms.
Instead, current thinking focuses on the following possibilities:
- Immune system. Some scientists think a virus or
bacterium may trigger ulcerative colitis. The digestive tract becomes
inflamed when your immune system tries to fight off the invading
microorganism (pathogen). It's also possible that inflammation may stem
from an autoimmune reaction in which your body mounts an immune response
even though no pathogen is present.
- Heredity. Because you're more likely to develop
ulcerative colitis if you have a parent or sibling with the disease,
scientists suspect that genetic makeup may play a contributing role.
However, most people who have ulcerative colitis don't have a family
history of this disorder
Complications:
Possible complications of ulcerative colitis include:
- Severe bleeding
- A hole in the colon (perforated colon)
- Severe dehydration
- Liver disease (rare)
- Kidney stones
- Osteoporosis
- Inflammation of your skin, joints and eyes
- An increased risk of colon cancer
- A rapidly swelling colon (toxic megacolon)
Treatments and drugs:
The goal of medical treatment is to reduce the inflammation that
triggers your signs and symptoms. In the best cases, this may lead not
only to symptom relief but also to long-term remission. Ulcerative
colitis treatment usually involves either drug therapy or surgery.
Doctors use several categories of drugs that control inflammation in
different ways. But drugs that work well for some people may not work
for others, so it may take time to find a medication that helps you. In
addition, because some drugs have serious side effects, you'll need to
weigh the benefits and risks of any treatment.
Anti-inflammatory drugs
Anti-inflammatory drugs are often the first step in the treatment of inflammatory bowel disease. They include:
- Sulfasalazine (Azulfidine). Sulfasalazine can be
effective in reducing symptoms of ulcerative colitis, but it has a
number of side effects, including nausea, vomiting, diarrhea, heartburn
and headache. Don't take this medication if you're allergic to sulfa
medications.
- Mesalamine (Asacol, Lialda, others), balsalazide (Colazal) and olsalazine (Dipentum).
These medications are available in oral forms and also in topical
forms, such as enemas and suppositories. Which form you take depends on
the area of your colon that's affected by ulcerative colitis. These
medications tend to have fewer side effects than sulfasalazine and are
generally very well tolerated. Your doctor may prescribe a combination
of two different forms, such as an oral medication and an enema or
suppository. Mesalamine can relieve signs and symptoms in more than 90
percent of people with mild ulcerative colitis. People with proctitis
tend to respond better to combination therapy with oral mesalamine and
suppositories. For left-sided colitis, a combination of oral mesalamine
and mesalamine enemas seems to work better than either agent alone if
symptoms are mild to moderate. Rare side effects include headache,
kidney problems and pancreas problems (pancreatitis).
- Corticosteroids. Corticosteroids can help reduce
inflammation, but they have numerous side effects, including weight
gain, excessive facial hair, mood swings, high blood pressure, type 2
diabetes, osteoporosis, bone fractures, cataracts, glaucoma and an
increased susceptibility to infections. Doctors generally use
corticosteroids only if you have moderate to severe inflammatory bowel
disease that doesn't respond to other treatments. Corticosteroids aren't
for long-term use, and the dose is usually tapered down over two to
three months.
They may also be used in conjunction with other medications as a means
to induce remission. For example, corticosteroids may be used with an
immune system suppressor — the corticosteroids can induce remission,
while the immune system suppressors can help maintain remission.
Occasionally, your doctor may also prescribe short-term use of steroid
enemas to treat disease in your lower colon or rectum.
Immune system suppressors
These drugs also reduce inflammation, but they target your immune system
rather than treating inflammation itself. Because immune suppressors
can be effective in treating ulcerative colitis, scientists theorize
that damage to digestive tissues is caused by your body's immune
response to an invading virus or bacterium or even to your own tissue.
By suppressing this response, inflammation is also reduced.
Immunosuppressant drugs include:
-
Azathioprine (Azasan, Imuran) and mercaptopurine (Purinethol).
Because azathioprine and mercaptopurine act slowly — taking three
months or longer to start working — they're sometimes initially combined
with a corticosteroid, but in time, they seem to produce benefits on
their own and the steroids can be tapered off.
Side effects can include allergic reactions, bone marrow suppression,
infections, and inflammation of the liver and pancreas. There also is a
small risk of development of cancer with these medications. If you're
taking either of these medications, you'll need to follow up closely
with your doctor and have your blood checked regularly to look for side
effects. If you've had cancer, discuss this with your doctor before
starting these medications.
- Cyclosporine (Gengraf, Neoral, Sandimmune). This
potent drug is normally reserved for people who don't respond well to
other medications or who face possible surgery because of severe
ulcerative colitis. In some cases, cyclosporine may be used to delay
surgery until you're strong enough to undergo the procedure. In others,
it's used to control signs and symptoms until less toxic drugs start
working. Cyclosporine begins working in one to two weeks, but because it
has the potential for severe side effects, including kidney damage,
seizures and fatal infections, talk to your doctor about the risks and
benefits of treatment. There's also a small risk of cancer with these
medications, so let your doctor know if you've previously had cancer.
-
Infliximab (Remicade). This drug is specifically for
those with moderate to severe ulcerative colitis who don't respond to or
can't tolerate other treatments. It works quickly to bring on
remission, especially for people who haven't responded well to
corticosteroids. This drug can sometimes prevent surgery for some
people. It works by neutralizing a protein produced by your immune
system known as tumor necrosis factor (TNF). Infliximab finds TNF in
your bloodstream and removes it before it causes inflammation in your
intestinal tract.
Some people with heart failure, people with multiple sclerosis, and
people with cancer or a history of cancer can't take infliximab. The
drug has been linked to an increased risk of infection, especially
tuberculosis and reactivation of viral hepatitis, and may increase your
risk of blood problems and cancer. You'll need to have a skin test for
tuberculosis, a chest X-ray and a test for hepatitis B before taking
infliximab.
Also, because infliximab contains mouse protein, it can cause serious
allergic reactions in some people — reactions that may be delayed for
days to weeks after starting treatment. Once started, infliximab is
generally continued as long-term therapy, although its effectiveness may
decrease over time.
- Adalimumab (Humira) is an alternative to inflixmab
for people whose ulcerative colitis has not been helped by other
medications such as azathioprine or 6 mercaptopurine. It may also be
considered for people who initially improve with infliximab but then
improvement stops; but its benefit in this situation remains unproven.
Adalimumab, like infliximab, carries a small risk of infections,
including tuberculosis and serious fungal infections. Before taking
adalimumab, you should have a skin test for tuberculosis, a chest X-ray
and a test for hepatitis B. The most common side effects of adalimumab
are skin irritation and pain at the injection site, nausea, runny nose
and upper respiratory infection.
Other medications
In addition to controlling inflammation, some medications may help
relieve your signs and symptoms. Depending on the severity of your
ulcerative colitis, your doctor may recommend one or more of the
following:
- Antibiotics. People with ulcerative colitis who run fevers will likely be given antibiotics to help prevent or control infection.
- Anti-diarrheals. For severe diarrhea, loperamide
(Imodium) may be effective. Use anti-diarrheal medications with great
caution, however, because they increase the risk of toxic megacolon.
- Pain relievers. For mild pain, your doctor may
recommend acetaminophen (Tylenol, others). Don't use ibuprofen (Advil,
Motrin, others), naproxen (Aleve) or aspirin. These are likely to make
your symptoms worse.
- Iron supplements. If you have chronic intestinal bleeding, you may
develop iron deficiency anemia. Taking iron supplements may help restore
your iron levels to normal and reduce this type of anemia once your
bleeding has stopped or diminished.
Surgery
If diet and lifestyle changes, drug therapy, or other treatments don't
relieve your signs and symptoms, your doctor may recommend surgery.
Surgery can often eliminate ulcerative colitis. But that usually means
removing your entire colon and rectum (proctocolectomy). In the past,
after this surgery you would wear a small bag over an opening in your
abdomen (ileal stoma) to collect stool. But a procedure called ileoanal
anastomosis eliminates the need to wear a bag. Instead, your surgeon
constructs a pouch from the end of your small intestine. The pouch is
then attached directly to your anus. This allows you to expel waste more
normally, although you may have more-frequent bowel movements that are
soft or watery because you no longer have your colon to absorb water.
Pregnancy
Women with ulcerative colitis can usually have successful pregnancies,
especially if they can keep the disease in remission during pregnancy.
Ideally, you'll become pregnant when your disease is in remission. Some
medications may not be indicated for use in pregnancy, especially during
the first trimester, and the effects of certain medications may linger
after you stop them. Talk with your doctor about the best way to manage
your illness before you conceive. If you stop certain medications, their
effects may linger. It's estimated that the risk of passing ulcerative
colitis to your unborn child if your partner doesn't have ulcerative
colitis is less than 10 percent.
Cancer surveillance
Screening for colon cancer often needs to be done more frequently
because people who have ulcerative colitis have an increased risk of
colon cancer. It's recommended that people with pancolitis begin colon
cancer screening with a colonoscopy eight years after diagnosis. For
those who have left-sided colitis, screening with colonoscopy is
recommended beginning 10 years after diagnosis. People with proctitis
can follow the usual colon cancer screening guidelines that call for a
colonoscopy every 10 years beginning at age 50.