Overview
Irritable Bowel Syndrome (IBS) is a common gastrointestinal disorder that affects the large intestine, causing problems with bowel movements and abdominal discomfort. It is a functional disorder, meaning the intestines look normal but don’t work properly. Symptoms can range from mild to severe and often fluctuate over time.

Why It’s Important
IBS can significantly impact daily life, work, and mental health due to recurring pain, urgency, or bloating. While it does not cause permanent damage or increase the risk of serious disease like cancer, it can lead to chronic discomfort and decreased quality of life, making management important.

Quick Facts

• Affects 10–15% of adults worldwide

• More common in women than men

• Chronic condition with periodic flare-ups

• Types include IBS-C (constipation), IBS-D (diarrhea), IBS-M (mixed), and IBS-U (unclassified)

What Happens in the Body
IBS involves irregular muscle contractions in the intestines, heightened sensitivity to bowel stretching, and sometimes disturbances in gut-brain signaling. This can lead to abdominal pain, bloating, and changes in stool consistency. Stress, diet, and hormonal changes can trigger or worsen symptoms.

Common Signs and Symptoms

• Abdominal pain or cramping, often relieved by bowel movements

• Bloating or gas

• Diarrhea, constipation, or alternating between both

• Mucus in stool

• Urgency or incomplete bowel movements

Diagnosis

• Based on symptoms and medical history (Rome IV criteria)

• Physical exam and review of bowel habits

• Rule out other conditions with blood tests, stool tests, or colonoscopy if alarm symptoms exist

• Diagnosis is often clinical, especially in younger adults with typical symptoms

Treatment and Management

• Dietary changes: High-fiber diet, low-FODMAP diet, avoiding trigger foods

• Medications: Antispasmodics, laxatives for IBS-C, anti-diarrheal for IBS-D, probiotics

• Lifestyle modifications: Stress management, regular exercise, adequate sleep

• Behavioral therapy: Cognitive behavioral therapy (CBT) or gut-directed hypnotherapy

• IBS is manageable but not curable; symptom control is the main goal

Risks and Complications

• Chronic discomfort affecting quality of life

• Anxiety or depression due to persistent symptoms

• Rare complications like severe constipation leading to fecal impaction

• Misdiagnosis may delay treatment for other conditions

Who Is at Risk

• Women (particularly under age 50)

• People with history of gastrointestinal infections

• Those with high stress levels or anxiety disorders

• Family history of IBS or other functional GI disorders

Related Conditions

• Functional dyspepsia

• Fibromyalgia and chronic pain syndromes

• Anxiety and depression

• Inflammatory bowel disease (IBD), which must be ruled out

When to See a Doctor
Seek medical care if you experience:

• Sudden changes in bowel habits after age 50

• Blood in stool or black stools

• Unexplained weight loss

• Severe or persistent abdominal pain

• Symptoms that interfere with daily life

Last Updated: October 2, 2025