Irritable Bowel Syndrome - What Causes It?

David March 25th, 2006

What causes one person to have Irritable Bowel Syndrome and not another? No one knows. Symptoms cannot be traced to a single organic cause. Research suggests that people with Irritable Bowel Syndrome seem to have a colon that is more sensitive and reactive than usual to a variety of things, including certain foods and stress.

Some evidence indicates that the immune system, which fights infection, is also involved. Irritable Bowel Syndrome symptoms result from the following: The normal motility of the colon may not work properly. It can be spasmodic or can even stop temporarily. Spasms are sudden strong muscle contractions that come and go.

The lining of the colon (epithelium), which is affected by the immune and nervous systems, regulates the passage of fluids in and out of the colon. In Irritable Bowel Syndrome, the epithelium appears to work properly. However, fast movement of the colon’s contents can overcome the absorptive capacity of the colon. The result is too much fluid in the stool. In other patients, colonic movement is too slow, too much fluid is absorbed, and constipation develops.

The colon responds strongly to stimuli (for example, foods or stress) that would not bother most people.

In people with Irritable Bowel Syndrome, stress and emotions can strongly affect the colon. It has many nerves that connect it to the brain. Like the heart and the lungs, the colon is partly controlled by the autonomic nervous system, which has been proven to respond to stress. For example, when you are frightened, your heart beats faster, your blood pressure may go up, or you may gasp. The colon responds to stress also. It may contract too much or too little. It may absorb too much water or too little.
Research has shown that very mild or hidden (occult) celiac disease is present in a smaller group of people with symptoms that mimic Irritable Bowel Syndrome. People with celiac disease cannot digest gluten, which is present in wheat, rye, barley, and possibly oats. Foods containing gluten are toxic to these people, and their immune system responds by damaging the small intestine. A blood test can determine whether celiac disease is present. (For information about celiac disease, see the Celiac Disease fact sheet from the National Institute of Diabetes and Digestive and Kidney Diseases (NIDDK).)

The following have been associated with a worsening of Irritable Bowel Syndrome symptoms:

  • Large meals
  • Bloating from gas in the colon
  • Medicines
  • Wheat, rye, barley, chocolate, milk products, or alcohol
  • Drinks with caffeine, such as coffee, tea, or colas
  • Stress, conflict, or emotional upsets

Researchers have also found that women with Irritable Bowel Syndrome may have more symptoms during their menstrual periods, suggesting that reproductive hormones can exacerbate Irritable Bowel Syndrome problems.

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3 Responses to “Irritable Bowel Syndrome - What Causes It?”

  1. Sigrid Gangsoyon 31 Aug 2007 at 2:16 am

    Hi there,

    Thanks for your information on the differences it makes to change your diet. I have recently eliminated bread, dairy, alcohol and red meat and feel a whole lot better. I believe that diet is the basis of living a healthy more productive life.

    Thanks
    Sigrid Gangsoy
    http://locatereviews.com/131091754

  2. pluspeteeson 24 Feb 2008 at 5:23 am

    Of course, pulse of our bigteets are consequently as picky as Nancy’s, but we’re crazily snooping the tacks natty for Nancy by steeling these patients with indeterminate tops. She sounded like I felt.

  3. [...] Irritable Bowel Syndrome - What Causes It? Some evidence indicates that the immune system, which fights infection, is also involved. Irritable Bowel Syndrome symptoms result from the following: The normal motility of the colon may not work properly. It can be spasmodic or can even stop temporarily. Spasms are sudden strong muscle contractions that come and go.The lining of the colon (epithelium), which is affected by the immune and nervous systems, regulates the passage of fluids in and out of the colon. In Irritable Bowel Syndrome, the epithelium appears to work properly. However, fast movement of the colon’s contents can overcome the absorptive capacity of the colon. The result is too much fluid in the stool. In other patients, colonic movement is too slow, too much fluid is absorbed, and constipation develops.The colon responds strongly to stimuli (for example, foods or stress) that would not bother most people.In people with Irritable Bowel Syndrome, stress and emotions can strongly affect the colon. It has many nerves that connect it to the brain. Like the heart and the lungs, the colon is partly controlled by the autonomic nervous system, which has been proven to respond to stress. For example, when you are frightened, your heart beats faster, your blood pressure may go up, or you may gasp. The colon responds to stress also. It may contract too much or too little. It may absorb too much water or too little.Research has shown that very mild or hidden (occult) celiac disease is present in a smaller group of people with symptoms that mimic Irritable Bowel Syndrome. People with celiac disease cannot digest gluten, which is present in wheat, rye, barley, and possibly oats. Foods containing gluten are toxic to these people, and their immune system responds by damaging the small intestine. A blood test can determine whether celiac disease is present. (For information about celiac disease, see the Celiac Disease fact sheet from the National Institute of Diabetes and Digestive and Kidney Diseases (NIDDK).)The following have been associated with a worsening of Irritable Bowel Syndrome symptoms:-Large meals -Bloating from gas in the colon -Medicines -Wheat, rye, barley, chocolate, milk products, or alcohol -Drinks with caffeine, such as coffee, tea, or colas -Stress, conflict, or emotional upsetsResearchers have also found that women with Irritable Bowel Syndrome may have more symptoms during their menstrual periods, suggesting that reproductive hormones can exacerbate Irritable Bowel Syndrome problems.By: David CowgillAbout the Author: Article Source: Irritable Bowel Syndrome - What Causes It? [...]

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