Irritable bowel syndrome (IBS) is a common disorder that affects the large intestine (colon).
Irritable bowel syndrome commonly causes cramping, abdominal pain, bloating, gas, diarrhea and
constipation. IBS is a chronic condition that you will need to manage long term.
Even though signs and symptoms are uncomfortable, IBS — unlike ulcerative colitis and Crohn's
disease, which are forms of inflammatory bowel disease — doesn't cause changes in bowel tissue
or increase your risk of colorectal cancer.
Only a small number of people with irritable bowel syndrome have severe signs and symptoms. Some
people can control their symptoms by managing diet, lifestyle and stress. Others will need
medication and counseling.
The signs and symptoms of irritable bowel syndrome can vary widely from person to person and often
resemble those of other diseases. Among the most common are:
- Abdominal pain or cramping
- A bloated feeling
- Diarrhea or constipation — sometimes alternating bouts of constipation and diarrhea
- Mucus in the stool
For most people, IBS is a chronic condition, although there will likely be times when the signs and
symptoms are worse and times when they improve or even disappear completely.
When to see a doctor
Although as many as 1 in 5 American adults has signs and symptoms of irritable bowel syndrome, fewer
than 1 in 5 who have symptoms seek medical help. Yet it's important to see your doctor if you have a
persistent change in bowel habits or if you have any other signs or symptoms of IBS because these
may indicate a more serious condition, such as colon cancer.
Symptoms that may indicate a more serious condition include:
- Rectal bleeding
- Abdominal pain that progresses or occurs at night
- Weight loss
Your doctor may be able to help you find ways to relieve symptoms as well as rule out colon
conditions, such as inflammatory bowel disease and colon cancer. Your doctor can also help you avoid
possible complications from problems such as chronic diarrhea.
It's not known exactly what causes irritable bowel syndrome, but a variety of factors play a role.
The walls of the intestines are lined with layers of muscle that contract and relax in a coordinated
rhythm as they move food from your stomach through your intestinal tract to your rectum. If you have
irritable bowel syndrome, the contractions may be stronger and last longer than normal, causing gas,
bloating and diarrhea. Or the opposite may occur, with weak intestinal contractions slowing food
passage and leading to hard, dry stools.
Abnormalities in your gastrointestinal nervous system also may play a role, causing you to experience
greater than normal discomfort when your abdomen stretches from gas or stool. Poorly coordinated
signals between the brain and the intestines can make your body overreact to the changes that
normally occur in the digestive process. This overreaction can cause pain, diarrhea or
Triggers vary from person to person
Stimuli that don't bother other people can trigger symptoms in people with IBS — but not all
people with the condition react to the same stimuli. Common triggers include:
Foods. The role of food allergy or intolerance in irritable bowel syndrome is
not yet clearly understood, but many people have more severe symptoms when they eat certain
things. A wide range of foods has been implicated — chocolate, spices, fats, fruits,
beans, cabbage, cauliflower, broccoli, milk, carbonated beverages and alcohol to name a few.
Stress. Most people with IBS find that their signs and symptoms are worse or
more frequent during periods of increased stress, such as finals week or the first weeks on a
new job. But while stress may aggravate symptoms, it doesn't cause them.
Hormones. Because women are twice as likely to have IBS, researchers believe
that hormonal changes play a role in this condition. Many women find that signs and symptoms are
worse during or around their menstrual periods.
Other illnesses. Sometimes another illness, such as an acute episode of
infectious diarrhea (gastroenteritis) or too many bacteria in the intestines (bacterial
overgrowth), can trigger IBS.
Many people have occasional signs and symptoms of irritable bowel syndrome, but you're more likely to
have IBS if you:
- Are young. IBS tends to occur in people under age 45.
- Are female. Overall, about twice as many women as men have the condition.
Have a family history of IBS. Studies suggest that people who have a family
member with IBS may be at increased risk of the condition.
Have a mental health problem. Anxiety, depression, a personality disorder and a
history of childhood sexual abuse are risk factors. For women, domestic abuse may be a risk
factor as well.
The influence of family history on IBS risk may be related to genes, shared factors in a family's
environment or both.
Diarrhea and constipation, both signs of irritable bowel syndrome, can aggravate hemorrhoids. In
addition, if you avoid certain foods, you may not get enough of the nutrients you need, leading to
But the condition's impact on your overall quality of life may be the most significant complication.
These effects of IBS may cause you to feel you're not living life to the fullest, leading to
discouragement or depression.
Make an appointment with your doctor if you have symptoms of IBS. After an initial evaluation, your
doctor may refer you to a specialist in digestive disorders (gastroenterologist) for more extensive
Here's some information to help you prepare for your appointment and what to expect from your
What you can do
Write down any symptoms you're experiencing, and for how long. This may help
your doctor identify what triggers symptom episodes.
Write down key personal information, including any recent changes or stressors
in your life. These factors can play a key role in the frequency and severity of IBS symptoms.
Make a list of your key medical information, including any other conditions for
which you're being treated and the names of any medications, vitamins or supplements you're
taking. If you've been medically evaluated for your symptoms in the past, bring medical records
of those tests to your appointment.
Find a family member or friend who can come with you to the appointment, if
possible. Someone who accompanies you can help remember what the doctor says.
Write down questions to ask your doctor. Creating your list of questions in
advance can help you make the most of your time with your doctor.
For IBS, some basic questions to ask your doctor include:
- Do I have IBS?
- What other conditions might I have?
- Are there any other possible causes for my condition?
- What diagnostic tests do I need?
- What treatment approach do you recommend trying first?
- If the first treatment doesn't work, what will we try next?
- Are there any side effects associated with these treatments?
- Do you suspect that dietary factors are playing a role in my symptoms?
- What dietary changes are most likely to reduce my symptoms?
- Should I follow any specific diet?
- Are there any lifestyle changes I can make to help reduce or manage my symptoms?
- I have other health conditions. How can I best manage them together?
- Do you recommend that I talk with a counselor?
- Is my condition chronic?
- How much do you expect my condition may improve with treatment, including self-care?
In addition to the questions that you've prepared to ask your doctor, don't hesitate to ask questions
during your appointment.
What to expect from your doctor
Your doctor is likely to ask you a number of questions. Being ready to answer them may reserve time
to go over any points you want to spend more time on. You may be asked:
- What are your symptoms?
- When did you first notice these symptoms?
- Do your symptoms come and go or stay about the same?
Does anything seem to trigger your symptoms, including certain foods, stress or — in
women — your menstrual period?
- Have you lost weight without trying?
- Have you noticed any blood in your stools?
- Have your signs and symptoms included vomiting?
- Have your signs and symptoms included fever?
- Have you recently experienced significant stress, emotional difficulty or loss?
- What is your typical daily diet?
- Have you ever been diagnosed with a food allergy or with lactose intolerance?
- Have you been diagnosed with any other medical conditions?
What medications are you taking, including prescription and over-the-counter medications,
vitamins, herbs, and supplements?
- Do you have any family history of bowel disorders or colon cancer?
How much would you say your symptoms are affecting your quality of life, including your personal
relationships and your ability to function at school or work?
What you can do in the meantime
While you wait for your appointment, check with your family members to find out if any relatives have
been diagnosed with inflammatory bowel disease or colon cancer. In addition, start jotting down
notes about how often your symptoms occur and any factors that seem to trigger their occurrence.
A diagnosis of irritable bowel syndrome depends largely on a complete medical history and physical
Criteria for making a diagnosis
Because there are usually no physical signs to definitively diagnose IBS, diagnosis is often a
process of ruling out other conditions. To help this process, researchers have developed two sets of
diagnostic criteria for IBS and other functional gastrointestinal disorders — conditions in
which the bowel appears normal but doesn't work (function) normally. Both criteria are based on
symptoms after other conditions have been ruled out.
Rome criteria. According to these criteria, you must have certain signs and
symptoms before a doctor diagnoses irritable bowel syndrome. The most important are abdominal
pain and discomfort lasting at least three days a month in the last three months, associated
with two or more of following: improvement with defecation, altered frequency of stool or
altered consistency of stool.
Manning criteria. These criteria focus on pain relieved by defecation, having
incomplete bowel movements, mucus in the stool and changes in stool consistency. The more
symptoms present, the greater the likelihood of IBS.
Your doctor will likely assess how you fit these criteria, as well as whether you have any other
signs or symptoms that might suggest another, more serious, condition. Some red flag signs and
symptoms that suggest a need for additional testing include:
- New onset after age 50
- Weight loss
- Rectal bleeding
- Nausea or recurrent vomiting
Abdominal pain, especially if it's not completely relieved by a bowel movement, or occurs at
- Diarrhea that is persistent or awakens you from sleep
- Anemia related to low iron
If you fit the IBS criteria and don't have any red flag signs or symptoms, your doctor may suggest a
course of treatment without doing additional testing. But if you don't respond to that treatment,
you'll likely require more tests.
Your doctor may recommend several tests, including stool studies to check for infection or problems
with your intestine's ability to take in the nutrients from food (malabsorption). You may undergo a
number of tests to rule out other causes for your symptoms.
Flexible sigmoidoscopy. This test examines the lower part of the colon
(sigmoid) with a flexible, lighted tube (sigmoidoscope).
Colonoscopy. In some cases, especially if you are age 50 or older or have other
signs of a potentially more serious condition, your doctor may perform this diagnostic test in
which a small, flexible tube is used to examine the entire length of the colon.
X-ray (radiography). Sometimes doctors will use X-rays to obtain an image of
Computerized tomography (CT) scan. CT scans produce cross-sectional X-ray
images of internal organs. CT scans of your abdomen and pelvis may help your doctor rule out
other causes of your symptoms, especially if you have abdominal pain.
Lower GI series. In this test, doctors fill your large intestine with a liquid
(barium) to make it easier to see any problems on the X-ray.
Lactose intolerance tests. Lactase is an enzyme you need to digest the sugar
found in dairy products. If you don't produce this enzyme, you may have problems similar to
those caused by irritable bowel syndrome, including abdominal pain, gas and diarrhea. To find
out if this is the cause of your symptoms, your doctor may order a breath test or ask you to
remove milk and milk products from your diet for several weeks.
Breath tests. Your doctor may perform a breath test to look for a condition
called bacterial overgrowth, in which bacteria from the colon grow up into the small intestine,
leading to bloating, abdominal discomfort and diarrhea. This is more common among people who
have had bowel surgery or who have diabetes or some other disease that slows down digestion.
Blood tests. Celiac disease is sensitivity to wheat, barley and rye protein
that may cause signs and symptoms like those of irritable bowel syndrome. Blood tests can help
rule out this disorder. Children with IBS have a far greater risk of celiac disease than do
children who don't have IBS. If your doctor suspects that you have celiac disease, he or she may
perform an upper endoscopy to obtain a biopsy of your small intestine.
Stool tests. If you have chronic diarrhea, doctors may want to examine your
stool for bacteria or parasites.
Because it's not clear what causes irritable bowel syndrome, treatment focuses on the relief of
symptoms so that you can live as normally as possible.
In most cases, you can successfully control mild signs and symptoms of irritable bowel syndrome by
learning to manage stress and making changes in your diet and lifestyle. Try to avoid foods that
trigger your symptoms. Also try to get enough exercise, drink plenty of fluids and get enough
If your problems are moderate or severe, you may need more than lifestyle changes. Your doctor may
Eliminating high-gas foods. If you have bothersome bloating or are passing
considerable amounts of gas, your doctor may suggest that you cut out such items as carbonated
beverages, vegetables — especially cabbage, broccoli and cauliflower — and raw
Eliminating gluten. Research shows that some people with IBS report improvement
in diarrhea symptoms if they stop eating gluten (wheat, barley and rye). This recommendation
remains controversial, and the evidence is not clear.
Eliminating FODMAPs. Some people are sensitive to types of carbohydrates such
as fructose, fructans, lactose and others, called FODMAPs (fermentable oligo-, di-, and
monosaccharides and polyols). FODMAPs are found in certain grains, vegetables, fruits and dairy
products. However, often people are not bothered by every FODMAP food. You may be able to get
relief from your IBS symptoms on a strict low FODMAP diet and then reintroduce foods one at
Fiber supplements. Taking fiber supplements, such as psyllium (Metamucil) or
methylcellulose (Citrucel), with fluids may help control constipation. Fiber obtained from food
may cause much more bloating compared with a fiber supplement. If fiber doesn't help symptoms,
your doctor may prescribe an osmotic laxative such as milk of magnesia or polyethylene glycol.
Anti-diarrheal medications. Over-the-counter medications, such as loperamide
(Imodium), can help control diarrhea. Some people will benefit from medications called bile acid
binders, such as cholestyramine (Prevalite), colestipol (Colestid) or colesevelam (Welchol), but
these can lead to bloating.
Anticholinergic and antispasmodic medications. These medications, such as
hyoscyamine (Levsin) and dicyclomine (Bentyl), can help relieve painful bowel spasms. They are
sometimes used for people who have bouts of diarrhea, but they can worsen constipation and can
lead to other symptoms, such as difficulty urinating. They should also be used with caution
among people with glaucoma.
Antidepressant medications. If your symptoms include pain or depression,
your doctor may recommend a tricyclic antidepressant or a selective serotonin reuptake
inhibitor (SSRI). These medications help relieve depression as well as inhibit the activity
of neurons that control the intestines.
If you have diarrhea and abdominal pain without depression, your doctor may suggest a lower
than normal dose of tricyclic antidepressants, such as imipramine (Tofranil) or
nortriptyline (Pamelor). Side effects of these drugs include drowsiness and constipation.
SSRIs, such as fluoxetine (Prozac, Sarafem) or paroxetine (Paxil), may be helpful if you're
depressed and have pain and constipation.
Antibiotics. Some people whose symptoms are due to an overgrowth of bacteria in
their intestines may benefit from antibiotic treatment. Some people with symptoms of diarrhea
have benefited from rifaximin (Xifaxan), but more research is needed.
Counseling. You may benefit from counseling if you have depression or if stress
tends to worsen your symptoms.
Medication specifically for IBS
Two medications are currently approved for specific cases of IBS:
Alosetron (Lotronex). Alosetron is designed to relax the colon and slow the
movement of waste through the lower bowel. The Food and Drug Administration (FDA) removed it
from the market for a time, but has since allowed alosetron to be sold again.
However, alosetron can be prescribed only by doctors enrolled in a special program and is
intended for severe cases of diarrhea-predominant IBS in women who haven't responded to
other treatments. Alosetron is not approved for use by men. It has been linked to rare but
important side effects, so it should only be considered when other treatments are not
Lubiprostone (Amitiza). Lubiprostone works by increasing fluid secretion in
your small intestine to help with the passage of stool. It is approved for women age 18 and
older who have IBS with constipation. Its effectiveness in men is not proved, nor its long-term
safety. Common side effects include nausea, diarrhea and abdominal pain. Lubiprostone is
generally prescribed only for women with IBS and severe constipation for whom other treatments
haven't been successful.
In many cases, simple changes in your diet and lifestyle can provide relief from irritable bowel
syndrome. Although your body may not respond immediately to these changes, your goal is to find
long-term, not temporary, solutions:
Experiment with fiber. When you have irritable bowel syndrome, fiber can be
a mixed blessing. Although it helps reduce constipation, it can also make gas and cramping
worse. The best approach is to slowly increase the amount of fiber in your diet over a
period of weeks. Examples of foods that contain fiber are whole grains, fruits, vegetables
and beans. If your signs and symptoms remain the same or worse, tell your doctor. You may
also want to talk to a dietitian.
Some people do better limiting dietary fiber and instead take a fiber supplement that causes
less gas and bloating. If you take a fiber supplement, such as Metamucil or Citrucel, be
sure to introduce it slowly and drink plenty of water every day to reduce gas, bloating and
constipation. If you find that taking fiber helps your IBS, use it on a regular basis for
Avoid problem foods. If certain foods make your signs and symptoms worse,
don't eat them. These may include alcohol, chocolate, caffeinated beverages such as coffee
and sodas, medications that contain caffeine, dairy products, and sugar-free sweeteners such
as sorbitol or mannitol.
If gas is a problem for you, foods that might make symptoms worse include beans, cabbage,
cauliflower and broccoli. Fatty foods also may be a problem for some people. Chewing gum or
drinking through a straw can lead to swallowing air, causing more gas.
Eat at regular times. Don't skip meals, and try to eat about the same time each
day to help regulate bowel function. If you have diarrhea, you may find that eating small,
frequent meals makes you feel better. But if you're constipated, eating larger amounts of
high-fiber foods may help move food through your intestines.
Take care with dairy products. If you're lactose intolerant, try substituting
yogurt for milk. Or use an enzyme product to help break down lactose. Consuming small amounts of
milk products or combining them with other foods also may help. In some cases, though, you may
need to stop eating dairy foods completely. If so, be sure to get enough protein, calcium and B
vitamins from other sources.
Drink plenty of liquids. Try to drink plenty of fluids every day. Water is
best. Alcohol and beverages that contain caffeine stimulate your intestines and can make
diarrhea worse, and carbonated drinks can produce gas.
Exercise regularly. Exercise helps relieve depression and stress, stimulates
normal contractions of your intestines, and can help you feel better about yourself. If you've
been inactive, start slowly and gradually increase the amount of time you exercise. If you have
other medical problems, check with your doctor before starting an exercise program.
Use anti-diarrheal medications and laxatives with caution. If you try
over-the-counter anti-diarrheal medications, such as Imodium or Kaopectate, use the lowest
dose that helps. Imodium may be helpful if taken 20 to 30 minutes before eating, especially
if you know that the food planned for your meal is likely to cause diarrhea.
In the long run, these medications can cause problems if you don't use them correctly. The
same is true of laxatives. If you have any questions about them, check with your doctor or
The following nontraditional therapies may help relieve symptoms of IBS:
Acupuncture. Researchers have found that acupuncture may help improve symptoms
for people with IBS.
Herbs. Peppermint is a natural antispasmodic that relaxes smooth muscles in
the intestines. Peppermint may provide short-term relief of IBS symptoms, but study results
have been inconsistent. If you'd like to try peppermint, be sure to use enteric-coated
capsules. Peppermint may make heartburn worse. Before taking any herbs, check with your
doctor to be sure they won't interact or interfere with other medications.
A blend of herbs called STW 5 (Iberogast) has been shown to help some people.
Hypnosis. Hypnosis may reduce abdominal pain and bloating. A trained
professional teaches you how to enter a relaxed state and then guides you in relaxing your
Probiotics. Probiotics are "good" bacteria that normally live in your
intestines and are found in certain foods, such as yogurt, and in dietary supplements. It's
been suggested that if you have irritable bowel syndrome, you may not have enough good
bacteria and that adding probiotics to your diet may help ease your symptoms.
Recent studies suggest that certain probiotics may relieve symptoms of IBS, such as abdominal
pain, bloating, diarrhea and quality of life, although additional investigation is
Regular exercise, yoga, massage or meditation. These can all be useful ways to
relieve stress. You can take classes in yoga and meditation or practice at home using books or
Living with irritable bowel syndrome presents daily challenges. It may be painful or embarrassing and
can seriously affect the quality of your life. These suggestions may help you cope more easily:
Learn as much about IBS as you can. Talk to your doctor, look for information
on the Internet from reputable sources such as the National Institutes of Health, and read books
and pamphlets. Being informed about your condition can help you take better charge of it.
Identify the factors that trigger IBS. This is a key step both in managing your
condition and in helping you feel you have control of your life.
Seek out others with IBS. Talking to people who know what you're going through
can be reassuring. Try IBS support groups on the Internet or in your community.
Anyone can experience digestive upset from worry or anxiety. But if you have irritable bowel
syndrome, stress-related problems such as abdominal pain and diarrhea tend to occur more often and
be more severe. Finding ways to deal with stress may help prevent or ease symptoms:
Counseling. In some cases, a psychologist or psychiatrist can help you learn to
reduce stress by looking at how you respond to events and then working with you to modify or
change that response.
Biofeedback. This stress-reduction technique helps you reduce muscle tension
and slow your heart rate with the feedback help of a machine. You're then taught how to produce
these changes yourself. The goal is to help you enter a relaxed state so that you can cope more
easily with stress.
Progressive relaxation exercises. These help you relax muscles in your body,
one by one. Start by tightening the muscles in your feet, then concentrate on slowly letting all
of the tension go. Next, tighten and relax your calves. Continue until the muscles in your body,
including those in your eyes and scalp, are relaxed.
Deep breathing. Most adults breathe from their chests. But you become calmer
when you breathe from your diaphragm, the muscle that separates your chest from your abdomen.
When you inhale, allow your belly to expand. When you exhale, your belly naturally contracts.
Deep breathing can also help relax your abdominal muscles, which may lead to more-normal bowel
Mindfulness training. This stress-reduction technique helps you focus on being
in the moment and letting go of worries and distractions.
Other techniques. Set aside at least 20 minutes a day for any activity you find
relaxing — listening to music, reading, playing computer games or just soaking in a warm
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