Intro to (IBD) Inflammatory bowel disease
Inflammatory bowel disease (IBD) involves chronic inflammation of all or part of your digestive tract. IBD primarily includes ulcerative colitis and Crohn's disease. Both usually involve severe diarrhea, pain, fatigue and weight loss. IBD can be debilitating and sometimes leads to life-threatening complications.
Ulcerative colitis (UL-sur-uh-tiv koe-LIE-tis) is an inflammatory bowel disease that causes long-lasting inflammation and sores (ulcers) in the innermost lining of your large intestine (colon) and rectum.
Crohn's disease is an IBD that cause inflammation of the lining of your digestive tract. In Crohn's disease, inflammation often spreads deep into affected tissues. The inflammation can involve different areas of the digestive tract — the large intestine, small intestine or both.
Collagenous (kuh-LAJ-uh-nus) colitis and lymphocytic colitis also are considered inflammatory bowel diseases but are usually regarded separately from classic inflammatory bowel disease.
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What are the symptoms of IBD?
Inflammatory bowel disease symptoms vary, depending on the severity of inflammation and where it occurs. Symptoms may range from mild to severe. You are likely to have periods of active illness followed by periods of remission.
Signs and symptoms that are common to both Crohn's disease and ulcerative colitis include:
- Diarrhea. Diarrhea is a common problem for people with IBD.
- Fever and fatigue. Many people with IBD experience a low-grade fever. You may also feel tired or have low energy.
- Abdominal pain and cramping. Inflammation and ulceration can affect the normal movement of contents through your digestive tract and may lead to pain and cramping. You may also experience nausea and vomiting.
- Blood in your stool. You might notice bright red blood in the toilet bowl or darker blood mixed with your stool. You can also have bleeding you don't see (occult blood).
- Reduced appetite. Abdominal pain and cramping, as well as inflammation, can affect your appetite.
- Unintended weight loss. You may lose weight and even become malnourished because you cannot properly digest and absorb food.
Ulcerative colitis is classified according to the location of inflammation and severity of symptoms:
- Ulcerative proctitis. Inflammation is confined to the area closest to the anus (rectum), and rectal bleeding may be the only sign of the disease. This form of ulcerative colitis tends to be the mildest.
- Proctosigmoiditis. Inflammation involves the rectum and sigmoid colon (lower end of the colon). Signs and symptoms include bloody diarrhea, abdominal cramps and pain, and an inability to move the bowels in spite of the urge to do so (tenesmus).
- Left-sided colitis. Inflammation extends from the rectum up through the sigmoid and descending colon. Signs and symptoms include bloody diarrhea, abdominal cramping and pain on the left side, and unintended weight loss.
- Pancolitis. Pancolitis often affects the entire colon and causes bouts of bloody diarrhea that may be severe, abdominal cramps and pain, fatigue, and significant weight loss.
- Acute severe ulcerative colitis. Previously called fulminant colitis, this rare form of colitis affects the entire colon and causes severe pain, profuse diarrhea, bleeding, fever and inability to eat.
Crohn's disease may involve inflammation in different parts of the digestive tract in different people. The most common areas affected are the last part of the small intestine (ileum) and the colon. Inflammation may be confined to the bowel wall, which can lead to narrowing from inflammation or scarring or both (fibrostenosis), or may tunnel through the bowel wall (fistula). Narrowing may lead to a blockage (obstruction). Obstructions, stenosis and fistulas are not associated with ulcerative colitis.
What causes IBD?
The exact cause of inflammatory bowel disease remains unknown. Previously, diet and stress were suspected, but now doctors know that these factors may aggravate but don't cause IBD.
One possible cause is an immune system malfunction. When your immune system tries to fight off an invading virus or bacterium, an abnormal immune response causes the immune system to attack the cells in the digestive tract, too. Heredity also seems to play a role in that IBD is more common in people who have family members with the disease. However, most people with IBD don't have this family history.