What Causes Irritable Bowel Syndrome?

Cramping, abdominal pain, bloating, constipation, and diarrhea are some of the common and uncomfortable symptoms of irritable bowel syndrome (IBS). Unfortunately, no one has yet discovered a specific cause for IBS, but there are many factors that are correlated with it. There are two main categories of risk factors that can contribute to IBS—those that you can't change, and those that you can.

Uncontrollable Risk Factors
These variables are out of your control. Although you can't do anything to change them, it's important to know what has been associated with the development of IBS symptoms.
  • Your gender. Women are at least twice as likely to experience IBS as men. Due to fluctuating levels of hormones, women are more likely to experience IBS symptoms during or around the time of their menstrual periods.
  • Your family history. You are more likely to experience IBS if people in your family have/had the disorder.
  • Your age. Younger to middle-aged adults are most likely to experience IBS. In fact, half of all people with IBS will first develop symptoms before they are 35 years old, with 90% of IBS sufferers developing symptoms before age 50.
  • Your health history. Some experts believe that IBS may be caused by a bacterial infection in the gastrointestinal tract. But other health conditions that can cause IBS symptoms include: celiac disease (intolerance of gluten from grains), chronic fatigue syndrome, fibromyalgia (widespread bodily pain), and temporomandibular disorder (jaw pain and discomfort).
  • Your psychological health. Psychological conditions, such as panic disorder, depression and anxiety have been associated with IBS and gastrointestinal distress. If you are experiencing either of these conditions, consult with a therapist or doctor.
  • Your sensitivity level. Some people’s bowels are just more sensitive. Although you can’t change the sensitivity level of your large intestine, you can learn what commonly triggers your IBS symptoms, and try to avoid these triggers (see Controllable Risk Factors below).
  • Your immune and nervous systems. These systems regulate the functioning of the colon and the speed at which its contents move. Abnormal movement can lead to either extremely loose stools or constipation.
  • Your serotonin levels. Ninety-five percent of the body’s serotonin (a neurotransmitter that sends chemical messages in the body) is located in the gastrointestinal tract. If levels of this important neurotransmitter are off balance, bowels problems and IBS symptoms can result.
  • Psychosocial factors. IBS is more common in people who have a history of psychological trauma and abuse (physical, sexual, or emotional).

Controllable Risk Factors
Controllable risk factors are behaviors and factors that you can modify to lower your risk of suffering from IBS. There are many factors that have been associated with an increase of IBS symptoms that can be controlled or modified.
  • Your weight. Research shows that people with higher BMI's are more likely to experience gastrointestinal pain. Eating a healthy diet and exercising regularly can help you lose weight and reduce IBS symptoms.
  • Your diet. For some people, certain foods can cause IBS symptoms to flare up. Alcohol, barley, caffeine, chocolate, coffee, milk products, rye, soda, tea, and/or wheat are common triggers. Experiment with a rotating elimination of each of these foods for a week, and see if your symptoms improve. Foods that cause gas can also be problematic, resulting in bloating and discomfort—especially if you try to hold it in. Avoid gas-producing foods, or talk to your doctor about gas-relieving medications. Learn more about how your diet affects digestive distress.
  • Your eating habits. Eating large meals can contribute to IBS symptoms, while eating smaller, more frequent meals can help reduce discomfort. Get more tips for eating with IBS.
  • Your medications. Several types of medications can cause IBS symptoms. If you think your medication may be contributing to your symptoms, talk to your doctor about finding an alternative medication for your condition that doesn't have this negative side effect.
  • Your stress levels. Uncontrolled, chronic stress can cause colon spasms in people with IBS. Although it's impossible to control all the stressors in your life, take time to relax and relieve stress through exercise, meditation, yoga or other techniques.
Although IBS causes much physical pain and emotional stress, the good news is that it does not cause permanent damage to the body. Rather than let this condition control your life, consult with your doctor about how other lifestyle modifications or medications can help prevent and control your symptoms.
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Member Comments

I have these issues, thanks foe the information. Report
Good article! Great information! Report
Good article! Report
thanks Report
Thanks for this one, Coach Nicole! Great advice! Report
I've had IBS for about 35 years. At times it's not a problem, other times it rules my life and my activities. Report
Great article! Report
I have friends with IBM that all swear by different 'cures'. Truly an individual disease . Report
Good article but great comments on what helped different individuals. Diary makes mine worse but eating a lot of vegetables regulates me a little more Report
Thanks for this article. It's really helpful to me. Report
Think it is interesting that some illnesses, like this one, have a component you can do something about while at the same time having components for which there is nothing which can be done. Report
Thanks for sharing such a nice thoughts on Causes of Irritable Bowel Syndrome,It was really helpful one.
I was diagnosed with IBS when I was in high school. I tried so many different things over the years that didn't work, and finally just learned to live with it. About 2 years ago I started focusing more on healthy eating, and started eating 1 yogurt every day for either breakfast, or a mid-morning snack. I didn't eat any special kind of yogurt, or any specific brand, just whatever is on sale, and regular ol' yogurt. Now, I eat strictly Greek yogurt, but starting out, I didn't. After doing this consistently for a while (I didn't notice a change overnight, it took several months) I noticed that my IBS symptoms started to subside. Now, about 2 years later, my symptoms are virtually non-existent (and have been for quite some time). If I run out of yogurt and I go a few days without it, I have noticed my symptoms will start to come back. It may not work for everybody, but if you're like I was and have tried everything and nothing's worked, it might be worth a shot. Report
Probiotics ,limiting my dairy and dealing better with my stress all got my IBS totally under control. It changed my life from constant pain and being unable to exercise or enjoy life fully to being pain free and enjoying life with little fear of IBS interfering. Yogurt was not enough I needed to get the health food stores refrigerated type of probiotic to work well. Report
I had all those symptoms and they removed 6 polyps a few weeks ago, I expected to get better but I am even worse, the Specialist did not come up with a diagnosis yet, and in theory I have no food allergies in my last tests results , however the dr. disagree. Tests results sometimes are positives to food allergies and sometimes they are not....

It is very confusing... I do not know what to do, just for the record, I am vegetarian since birth, I do not drink sodas, and I do not eat sweets like gum and similar. Report


About The Author

Nicole Nichols
Nicole Nichols
A certified personal trainer and fitness instructor with a bachelor's degree in health education, Nicole loves living a healthy and fit lifestyle and helping others do the same. Nicole was formerly SparkPeople's fitness expert and editor-in-chief, known on the site as "Coach Nicole." Make sure to explore more of her articles and blog posts.