What is Crohn's Disease?
Crohn's Disease is an ongoing disorder that causes inflammation of the digestive tract. Crohn’s Disease can affect any area of the gastrointestinal tract, from the mouth to the anus, but it most commonly affects the lower part of the small intestine, called the ileum.
What Causes Inflammatory Bowel Disease?
Crohn’s Disease is an inflammatory bowel disease, the general name for diseases that cause swelling in the intestines. Because the symptoms of Crohn’s Disease are similar to other intestinal disorders, such as irritable bowel syndrome and ulcerative colitis, it can be difficult to diagnose.
Ulcerative colitis causes inflammation and ulcers in the top layer of the lining of the large intestine. In Crohn’s Disease, all layers of the intestine may be involved, and normal healthy bowel can be found between sections of diseased bowel.
Crohn’s Disease affects men and women equally and seems to run in some families. About 20 percent of people with Crohn’s Disease have a blood relative with some form of inflammatory bowel disease, most often a brother or sister and sometimes a parent or child.
Crohn’s Disease can occur in people of all age groups, but it is more often diagnosed in people between the ages of 20 and 30. People of Jewish heritage have an increased risk of developing Crohn’s Disease, and African Americans are at decreased risk for developing Crohn’s Disease.
Crohn’s Disease may also be called ileitis or enteritis.
What causes Crohn's disease?
Theories for the causes of Crohn’s Disease have not been proven. The human immune system is made from cells and different proteins that protect people from infection. The most popular theory is that the body’s immune system reacts abnormally in people with Crohn’s Disease, mistaking bacteria, foods, and other substances for being foreign. The immune system’s response is to attack these “invaders.” During this process, white blood cells accumulate in the lining of the intestines, producing chronic inflammation, which leads to ulcerations and bowel injury.
Scientists do not know if the abnormality in the functioning of the immune system in people with Crohn’s Disease is a cause, or a result, of the Crohn's disease. Research shows that the inflammation seen in the gastrointestinal tract of people with Crohn’s disease involves several factors: the genes the patient has inherited, the immune system itself, and the environment. Foreign substances, also referred to as antigens, are found in the environment. One possible cause for inflammation caused by Crohn's Disease may be the body’s reaction to these antigens, or that the antigens themselves are the cause for the inflammation. Some scientists think that a protein produced by the immune system, called anti-tumor necrosis factor (TNF), may be a possible cause for the inflammation associated with Crohn’s disease.
Crohn's Disease symptoms?
The most common symptoms of Crohn’s disease are abdominal pain, often in the lower right area, and diarrhea. Rectal bleeding, weight loss, arthritis, skin problems, and fever may also occur with Crohn's Disease. Bleeding may be serious and persistent, leading to anemia. Children with Crohn’s disease may suffer delayed development and stunted growth. The range and severity of symptoms varies. Learning more about Crohn’s disease, it's causes and its treatments will enable the patient to take control of their life and health.
How is Crohn's Disease diagnosed?
A series of tests and thorough physical exam may be required to diagnose Crohn’s disease.
Blood tests may be done to check for anemia, which could indicate bleeding in the intestines. Blood tests may also uncover a high white blood cell count, which is a sign of inflammation somewhere in the body. By testing a stool sample, the doctor can tell if there is bleeding or infection in the intestines.
The doctor may do an upper GI series to look at the small intestine. For this test, the person drinks barium, a chalky solution that coats the lining of the small intestine, before x rays are taken.
The barium shows up white on x-ray film, revealing inflammation or other abnormalities in the intestine. If these tests show Crohn’s disease, more x rays of both the upper and lower digestive tract may be necessary to see how much of the GI tract is affected by the disease.
The doctor may also do a visual exam of the colon by performing either a sigmoidoscopy or a colonoscopy. For both of these tests, the doctor inserts a long, flexible, lighted tube linked to a computer and TV monitor into the anus.
A sigmoidoscopy allows the doctor to examine the lining of the lower part of the large intestine, while a colonoscopy allows the doctor to examine the lining of the entire large intestine. The doctor will be able to see any inflammation or bleeding during either of these exams, although a colonoscopy is usually a better test because the doctor can see the entire large intestine.
The doctor may also do a biopsy, which involves taking a sample of tissue from the lining of the intestine to view with a microscope.
Crohn's Disease Complications?
The most common complication is blockage of the intestine. Blockage occurs because the disease tends to thicken the intestinal wall with swelling and scar tissue, narrowing the passage.
Crohn’s disease may also cause sores, or ulcers, that tunnel through the affected area into surrounding tissues, such as the bladder, vagina, or skin. The areas around the anus and rectum are often involved. The tunnels, called fistulas, are a common complication and often become infected. Sometimes fistulas can be treated with medicine, but in some cases they may require surgery.
In addition to fistulas, small tears called fissures may develop in the lining of the mucus membrane of the anus. Nutritional complications are common in Crohn’s disease. Deficiencies of proteins, calories, and vitamins are well documented. These deficiencies may be caused by inadequate dietary intake, intestinal loss of protein, or poor absorption, also referred to as malabsorption.
Other complications associated with Crohn’s disease include arthritis, skin problems, inflammation in the eyes or mouth, kidney stones, gallstones, or other diseases of the liver and biliary system. Some of these problems resolve during treatment for disease in the digestive system, but some must be treated separately.
Crohn's Disease - Hope Through Research
The National Institute of Diabetes and Digestive and Kidney Diseases (NIDDK) conducts and supports research into many kinds of digestive disorders, including Crohn’s disease. Several clinical trials are currently evaluating the efficacy and safety of different therapies for the treatment of Crohn’s disease. For more information, visit www.clinicaltrials.gov
Crohn's & Colitis Foundation of America
386 Park Avenue South, 17th Floor
New York, NY 10016–8804
Phone: 1–800–932–2423 or 212–685–3440
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