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What is inflammatory bowel disease?

An estimated more than 1 million Americans have ulcerative colitis or Crohn’s disease, the two most common forms of inflammatory bowel disease (IBD). These conditions, which can be painful and debilitating, cause chronic inflammation of the digestive tract.

Ulcerative colitis and Crohn’s disease are very similar — so similar, in fact, that they're often mistaken for one another. Both inflame the lining of your digestive tract, and both can cause severe bouts of watery diarrhea and abdominal pain. But Crohn’s disease can occur anywhere in your digestive tract, often spreading deep into the layers of affected tissues. Ulcerative colitis, on the other hand, usually affects only the innermost lining (mucosa) of your large intestine (colon) and rectum.

No one knows exactly what causes IBD, although your immune response and certain genetic and environmental factors may play a role.

Currently, there’s no known cure for either ulcerative colitis or Crohn’s disease. But the news is encouraging. Researchers recently identified a gene that, when defective, can trigger Crohn’s disease in some people. This discovery may lead to more effective treatments in the future.

For now, several therapies are available that may dramatically reduce your symptoms and even bring about a long-term remission.


Digestive Center

Signs and symptoms

Ulcerative colitis and Crohn’s disease share many common symptoms. These symptoms, which may develop gradually or come on suddenly, include: Ulcerative colitis and Crohn's disease also differ in several key respects. Although Crohn’s disease often affects the lower part of the small intestine (ileum) or the colon, it can flare up anywhere in the digestive tract from the mouth to the anus. It usually consists of inflammation that may include large ulcers extending deep into the intestinal wall. Inflammation can appear in several places simultaneously, with areas of healthy tissue in between.

If you have ulcerative colitis, you’ll likely have inflammation only in the innermost lining of your colon and rectum. The affected areas will be continuous, with no patches of normal tissue. You may also develop small bleeding ulcers.

Symptoms of both diseases may range from mild to severe. If you have a mild case of Crohn’s disease, you’ll likely have no more than four diarrheal bowel movements a day, little or no abdominal pain, and be able to maintain a normal weight. But if your case is severe, you may have six or more diarrheal bowel movements a day along with severe abdominal pain, weight loss, fever and other complications.

Symptoms of mild ulcerative colitis include no more than four episodes of diarrhea a day, occasional blood in your stool and few, if any, complications. In more severe cases you may have six or more episodes of diarrhea a day, frequent blood in your stool, fever and other complications.

In general, though, the course of IBD varies greatly. You may remain completely without symptoms after the initial one or two episodes of the disease. Or you may have recurrent episodes of abdominal pain, diarrhea, and sometimes fever or bleeding.

Diarrhea
Anemia
Fever

Causes

No one is quite sure what causes IBD, although there’s a general consensus as to what doesn’t cause it. Researchers no longer believe that stress is the main culprit, although stress can often aggravate symptoms. Instead, current thinking focuses on the following possibilities:
Risk factors

Crohn’s disease and ulcerative colitis can strike at any age, but you’re most likely to develop IBD when you’re young. Thirty percent of people with the disease are ages 10 through 19, and most are between the ages of 15 and 35. The average age at diagnosis is 27.

An equal number of men and women have IBD. Although whites have the highest risk of the disease, it can strike any ethnic group. If you’re Jewish and of European descent, you’re five times more likely to have IBD than other whites.

You’re also at higher risk if you have a close relative, such as a parent, sibling or child, with the disease. If both your parents have IBD, there’s a 50 percent chance you’ll also develop the disease.

If you live in an urban area or in an industrialized country, you’re more likely to develop either Crohn’s disease or ulcerative colitis.

When to seek medical advice

See your doctor if you experience a change in your bowel habits that lasts longer than 10 days or if you have any of the symptoms of IBD, such as abdominal pain, blood in your stool, ongoing bouts of diarrhea that don't respond to over-the-counter (OTC) medications or an unexplained fever lasting more than 1 or 2 days.

Although Crohn’s disease and ulcerative colitis usually aren’t fatal, they are serious diseases and may require surgery. In some cases, they may cause life-threatening complications.

Screening and diagnosis

Your doctor will likely diagnose IBD only after ruling out all other possible causes for your symptoms, including irritable bowel syndrome (IBS), diverticulitis and colorectal cancer. To help confirm a diagnosis of ulcerative colitis or Crohn’s disease, you may have one or more of the following tests or procedures:
Video: Irritable bowel syndrome
Video: Flexible sigmoidoscopy
Video: Colonoscopy exam
Irritable bowel syndrome
Diverticulitis
Colorectal cancer
Barium enema
Flexible sigmoidoscopy
Colonoscopy

Complications

Both Crohn’s disease and ulcerative colitis can cause a number of complications, some of which can be quite serious.

Crohn’s disease

Crohn’s disease may result in your developing one or more of the following: No one knows exactly what causes these complications. Some researchers believe that the same immune system response that produces inflammation in your intestines may cause inflammation in other parts of your body.

Osteoarthritis
Kidney stones

Ulcerative colitis

The most serious acute complication of ulcerative colitis is toxic megacolon. This occurs when your colon becomes paralyzed, preventing you from having a bowel movement or passing gas. Symptoms include abdominal pain and swelling, fever and weakness. You might also become disoriented or groggy. If toxic megacolon isn’t treated, your colon may rupture, causing peritonitis, a life-threatening condition requiring emergency surgery. Having ulcerative colitis also makes it more likely you'll develop liver or bile duct disease, as well as skin, joint and eye inflammation.

IBD and colon cancer

Finally, both ulcerative colitis and Crohn's disease increase your risk of colon cancer. If you have ulcerative colitis, your risk is greatest if you've had the disease for at least 8 to 10 years and it has spread through your entire colon. You're less likely to develop cancer if only a small part of your colon is diseased.

The same is true for Crohn's disease. The longer you've had the disease and the larger the area affected, the greater your risk of colon cancer. But because Crohn’s doesn't usually affect the entire colon, cancer is less common in people with Crohn’s than in those with ulcerative colitis.

Nevertheless, if you've had any type of inflammatory bowel disease for 8 or more years, have a test for colon cancer at least once every 2 years. The most effective test is colonoscopy.

Cancer Center

Treatment

The goal of medical treatment is to reduce the inflammation that triggers symptoms. In the best cases, this may lead not only to symptom relief but also to long-term remission. Treatment for IBD 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:
High blood pressure
Diabetes
Osteoporosis
Cataract

Immune system suppressors

These drugs also reduce inflammation, but they target your immune system rather than treating inflammation itself. Because these drugs can be quite effective in treating IBD, scientists theorize that damage to digestive tissues is caused by your body’s immune response to an invading virus or bacteria or even to your own tissue. By suppressing this response, inflammation is also reduced. Immunosuppressant drugs include:
Tuberculosis

Antibiotics

Although antibiotics generally have no effect on ulcerative colitis, they can heal fistulas and abscesses in some people with Crohn’s disease. Typical antibiotics include: Nicotine patches

In clinical trials, nicotine skin patches (the same kind smokers use) seem to provide short-term relief from flare-ups of ulcerative colitis. In fact, the patches appear to eliminate symptoms in 4 out of 10 people. But they’re only effective in the short term — symptoms generally return in as little as 4 weeks.

How nicotine works isn't exactly clear. Researchers think it may protect your colon by thickening and increasing the mucus that covers the lining where inflammation typically occurs.

Other medications

In addition to controlling inflammation, some medications may help relieve your symptoms. Depending on how severe your IBS is, your doctor may recommend one or more of the following:
Constipation
Iron deficiency anemia

New treatments

Several new treatments that one day may effectively relieve symptoms with fewer side effects are in various stages of research.

One of the more intriguing treatments being studied is the use of human growth hormone (HGH) in combination with a high-protein diet to treat Crohn's disease. In a clinical trial, people treated with HGH saw a reduction in their symptoms after 1 month. The benefits continued for the rest of the trial. This improvement reduced the need for steroids and immunosuppressant drugs. Side effects, which included swelling and headaches, disappeared after about 4 weeks. More research will be needed to confirm these findings in other trials and determine the long-term benefits and risks of HGH therapy for people with Crohn’s disease.

Drugs that block a protein produced by your immune system known as tumor necrosis factor (TNF) are also being tested for the treatment of Crohn's disease. These include: In addition, researchers are currently testing synthetic versions of the naturally occurring proteins interleukin 10 and interleukin 12 for the treatment of Crohn’s disease. Testing also continues on the common blood-thinning medication, heparin. It may help control inflammation in ulcerative colitis.

Finally, one of the first gene-based drugs to emerge as a result of the latest genetic research may be keratinocyte growth factor-2, a medication aimed at stimulating the growth of healthy tissue in people with ulcerative colitis and chronic wounds such as bed sores.

Surgery

If diet and lifestyle changes, drug therapy or other treatments don't relieve your symptoms, your doctor may recommend surgery to remove a damaged portion of your digestive tract or to close fistulas or remove scar tissue.

In cases of Crohn's disease, surgery can buy years of remission at best. At the least, it may provide a temporary improvement in your symptoms. During surgery, your surgeon removes a damaged portion of your digestive tract and then reconnects the healthy sections. He or she may also close fistulas or remove scar tissue.

A recent Mayo Clinic study suggests that laparoscopic surgery using small incisions can lead to improved outcomes and shorter hospital stays for some people with Crohn’s disease.

Even so, the benefits of surgery for Crohn’s are only temporary. The disease often recurs, frequently near the reconnected tissue, and sometimes elsewhere in the digestive tract.

On the other hand, if you have ulcerative colitis, surgery can often eliminate the disease. But that usually means removing the entire colon and rectum (proctocolectomy). In the past, following this surgery you would wear a small bag over an opening in your abdomen to collect waste. But a procedure that has been used for about 20 years — 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 normally, although you may have as many as five to seven watery bowel movements a day because you no longer have your colon to absorb water.

Self-care

Sometimes you may feel helpless when facing Crohn's disease or ulcerative colitis. But simple changes in your diet and lifestyle may help control your symptoms and lengthen the time between flare-ups.

Diet

There’s no firm evidence that what you eat actually causes IBD. But certain foods and beverages can aggravate your symptoms, especially during a flare-up in your condition. Some people with ulcerative colitis or Crohn's disease need to restrict their diet all of the time, others just some of the time. For a few people, diet seems to make little difference.

It's a good idea to try eliminating from your diet anything that seems to make your symptoms worse. Here are some suggestions that may help: Stress

Although stress doesn't cause IBD, it can make your symptoms much worse and may trigger flare-ups. Stressful events can range from minor annoyances to a move, job loss or the death of a loved one.

When you're under stress, your normal digestive process changes. Your stomach empties more slowly and secretes more acids. Stress can also speed or slow the passage of waste through your intestines. It may also cause changes in intestinal tissue itself.

Although it's not always possible to avoid stress, you can learn ways to help manage it. Some of these include:
Food & Nutrition Center
Managing lactose intolerance
Stress: A conversation with a Mayo expert
Stress patrol: Stop tension in its tracks

Coping skills

Crohn's disease and ulcerative colitis don't just affect you physically — they take an emotional toll as well. If symptoms are severe, your life may revolve around a constant need to run to the bathroom. In some cases, you may barely be able to leave the house. When you do, you might worry about an accident, and this anxiety only makes your symptoms worse.

Even if your symptoms are mild, gas and abdominal pain can make it difficult to be out in public. You also may feel hampered by dietary restrictions or embarrassed by the nature of your disease. All of these factors — isolation, embarrassment and anxiety — can severely alter your life. Sometimes they may lead to depression.

One of the best ways to feel more in control is to find out as much as possible about IBD. In addition to talking to your doctor, look for information in books and on the Internet. You might find it especially helpful to talk to people who share your condition. Organizations such as the Crohn's and Colitis Foundation of America (CCFA) have chapters set up across the country. Your doctor, nurse or dietitian can locate the chapter nearest you, or you can contact the organization directly. In many parts of the country, local newspapers also publish the times and locations of various support group meetings.If possible, take your family with you to meetings. The more they know about your disease, the better able they'll be to understand what you're going through.

Although support groups aren't for everyone, they can provide valuable information about your condition as well as emotional support. Group members frequently know about the latest medical treatments or integrative therapies. You may also find it reassuring to be among people who understand what you're going through.

Some people find it helpful to consult a psychologist or psychiatrist who's familiar with inflammatory bowel disease and the emotional difficulties it can cause. Although living with ulcerative colitis or Crohn's disease can be discouraging, the outlook is definitely brighter than it was even a few years ago.

Depression

Complementary and alternative medicine

More and more people are interested in nontraditional approaches to healing, especially when standard treatments produce intolerable side effects or aren’t able to provide a cure. To address this growing interest, the National Institutes of Health established the National Center for Complementary and Alternative Medicine (NCCAM) in 1992. The Center’s mission is to explore nontraditional therapies in a scientifically rigorous way. In general, alternative medicine refers to therapies that may be used instead of conventional treatments. Complementary or integrative medicine, on the other hand, usually means therapies used in conjunction with traditional treatments. Complementary therapies may include acupuncture or acupressure, massage, music or art therapy, guided imagery, yoga, tai chi, and hypnosis. These definitions are very fluid, however. Sometimes acupuncture might be used exclusively to treat a colon problem, for instance.

Most alternative and complementary therapies don’t simply address a problem with the body. Instead, they focus on the entire person — body, mind and spirit. As a result, they can be especially effective at reducing stress, alleviating the side effects of conventional treatments and improving quality of life.

A study published in the May 1998 issue of American Journal of Gastroenterology reported that 51 percent of people with either Crohn’s disease or ulcerative colitis had used some form of alternative or complementary therapy. Most of these people cited side effects and ineffectiveness of conventional therapies as their primary reason for seeking alternative care. Improving quality of life and being treated as a whole person rather than as a disease were also major motivations.

NCCAM’s findings are available on their Web site. You can also talk to information specialists at the Center’s Clearinghouse by 888-644-6226 between 8:30 a.m. and 5 p.m. Eastern time.

January 22, 2002