Irritable Bowel Syndrome (IBS)


When functioning properly, the muscles of the digestive tract contract to move food through. Irritable Bowel Syndrome (IBS) occurs when normal digestive tract motility is disrupted, causing uncomfortable symptoms that affect about 1 in 6 Americans.

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Causes


There are many possible causes of Irritable Bowel Syndrome. For example, there may be a problem with muscles in the intestine, or the intestine may be more sensitive to stretching or movement.

infographic of understanding the connection for brain and gut in IBS. gemini generated image

Risk Factors

IBS can occur at any age, but it often begins in adolescence or early adulthood. It is more common in women and is the most common intestinal complaint for which patients are referred to a gastroenterologist. Stress can cause symptoms to worsen.

Common Symptoms of IBS 

Diagnostic Tests

Your doctor can often diagnose Irritable Bowel Syndrome based on your symptoms. Eating a lactose-free diet for 2 weeks may help the doctor evaluate for a possible lactase deficiency.

There is no specific test to diagnose IBS, but tests may be done to rule out other problems:

  • Blood tests to see if you have a low blood count (anemia)
  • Stool cultures to rule out an infection
  • Sigmoidoscopy
  • Colonoscopy

Treatment

The following lifestyle changes can be helpful in some cases of IBS:

  • Regular exercise
  • Improved sleep habits
  • Low-FODMAP Diet: Avoidance of foods and beverages that stimulate the intestines, such as caffeinated drinks
  • Avoidance of large meals and certain foods (wheat, chocolate, dairy products, alcohol, for instance)
  • Increased dietary fiber

No one medication will work for everyone, but your doctor may try:

  • Anticholinergic medications (dicyclomine, propantheline, belladonna and hyoscyamine) taken about a half-hour before eating to control colon muscle spasms
  • Loperamide to treat diarrhea
  • Low doses of tricyclic antidepressants to help relieve intestinal pain
  • Lubiprostone for constipation symptoms
  • Medications that relax muscles in the intestines
  • Counseling may help in cases of severe anxiety or depression.

When to See a Doctor


Most IBS symptoms can be managed at home, but you should reach out to a doctor if you notice:

  • Persistent or intense abdominal pain
  • Unexplained weight loss
  • Blood in your stool or black, tarry stools
  • Fever or signs of infection
  • Sudden, lasting changes in bowel habits
  • Symptoms that disrupt your daily routine

Early evaluation by a gastroenterologist can clarify the cause, guide effective treatment, and help you feel your best. At Charleston GI, our board-certified specialists can diagnose and manage IBS—no referral required, schedule appointment now.

FAQS


IBS Basics

What is IBS?
IBS, or Irritable Bowel Syndrome, is a gut disorder where the intestines do not work properly. It causes stomach pain, changes in bowel movements, bloating, and other digestive symptoms. It does not cause lasting damage.

Is IBS the same as IBD?
No. IBS is a functional disorder with no permanent damage. IBD includes Crohn’s disease and ulcerative colitis, which cause inflammation and lasting intestinal damage.

Why did my IBS start out of nowhere?
IBS can appear after a severe stomach infection, high stress, or antibiotics that change gut bacteria. Often the gut becomes more sensitive even after the initial cause is gone.

Symptoms and Pain

How do I know if I have IBS?
Doctors look for a pattern of symptoms over 3 to 6 months. Common signs include stomach pain or discomfort with bowel movements, changes in frequency or stool appearance, bloating, and feeling like you haven’t fully emptied your bowels.

What does IBS pain feel like?
People describe it as:

  • Balloon feeling: Sharp stretching pain from trapped gas
  • Charley horse: Intense cramping in the lower abdomen
  • Dull ache: Constant heavy feeling even after using the bathroom

Is it normal to have good weeks and bad weeks?
Yes. IBS is unpredictable. Flare-ups can happen due to sleep, stress, hormones, or other factors even if your diet is the same.

What are the most common non-stomach symptoms?
IBS can cause fatigue, muscle aches, brain fog, and bladder issues.

Triggers and Diet

What can I eat today?
Triggers vary by person. Many find relief with a low FODMAP diet. Avoid hard-to-digest carbs like:

  • Apples, pears, stone fruits
  • Onions, garlic, mushrooms
  • Milk and soft cheeses with lactose
  • High fructose corn syrup and sugar alcohols

Eat smaller, frequent meals. Keep a food diary to track what affects you.

Why does IBS flare up even with safe foods?
Flares are not always food-related. Lack of sleep, stress, hormones, or even eating in general can trigger symptoms. Management focuses on the whole body, not just diet.

Lifestyle and Stress

Does stress cause IBS?
Stress does not cause IBS but can worsen symptoms. The gut and brain are connected, so stress can speed up or slow digestion, causing pain and urgency.

Can I sleep with IBS?
Nighttime symptoms are common. Tips:

  • Keep a regular sleep schedule
  • Avoid large meals or trigger foods before bed
  • Sleep on your left side to aid digestion
  • Use relaxation techniques like deep breathing or meditation

Can I still have a social life or travel?
Yes. Planning helps:

  • Carry an emergency kit with clothes, wipes, and medications
  • Use apps to find restrooms
  • Check menus ahead for safe options

Diagnosis and Testing

Why are my tests normal if I feel sick?
In IBS, the gut looks normal. The problem is in how the nerves and muscles communicate. This is called visceral hypersensitivity.

Is IBS dangerous or a sign of cancer?
No. IBS does not cause cancer or permanent intestinal damage. See a doctor if you have red flag symptoms like unexplained weight loss, fever, or blood in stool.

Treatment and Management

Can IBS be cured or just managed?
There is no permanent cure, but IBS can be managed with:

  • Diet changes to avoid triggers
  • Exercise and good sleep habits
  • Medications for diarrhea, constipation, or cramps
  • Mental health support to manage gut-brain connections

Explore more on IBS


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Sources & Learn More

Research and Patient Support

Learn More About Managing IBS

  • Low-FODMAP Diet Guide – Discover how eliminating specific carbohydrates can reduce gas and bloating.
  • The Gut-Brain Connection – Understand why stress and anxiety directly impact your intestinal motility.
  • Symptom Tracker Tool – Download a log to track your triggers and share the results with your doctor.
  • IBS vs. IBD: What's the Difference? – Learn why these two conditions are often confused and how their treatments differ.

Medical Disclaimer: The information provided on this page is for educational purposes only. It is not intended to be a substitute for professional medical advice, diagnosis, or treatment. Always seek the advice of a qualified healthcare provider with any questions you may have regarding a medical condition.

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