What is the Difference Between IBD and IBS?

Written by Nicole Jacobson, RD, CNSC, National Therapeutic Line Director: Gastroenterology, Rheumatology, and Nutrition

If you’re unclear about how Inflammatory Bowel Disease (IBD) differs from Irritable Bowel Syndrome (IBS), you’re not the only one. These similarly named digestive disorders impact millions, yet they are quite distinct. Here’s a breakdown of what you should understand about each condition.

What is IBD?

Inflammatory Bowel Disease (IBD) is a group of conditions that cause inflammation in your digestive tract. Think of it as your immune system mistakenly attacking your own digestive system, causing inflammation and damage.

Types of IBD

Crohn’s Disease

Picture of Crohns disease concept. Intestine anatomical infographic. Inflammatory bowel disease. Inflammation of the digestive tract, abdominal pain, colon problem in human body. Medical flat vector illustration

  • It can affect any part of your digestive tract, from the mouth to the anus
  • Creates patchy inflammation with healthy areas in between (like random road construction zones)
  • Affects all layers of the intestinal wall
  • Can cause complications like narrowing of the intestine (strictures), abnormal connections between organs (fistulas), or pockets of infection (abscesses)

Ulcerative Colitis

Picture of ulcerative colitis caused by abnormal immune system usually affect only the inner layer of the bowel wall.

  • Only affects the colon and rectum
  • Creates continuous inflammation (no healthy patches in between)
  • Only affects the innermost lining of the colon
  • Often causes bleeding ulcers in the intestinal lining

Less Common Types

Microscopic Colitis: Causes inflammation visible only under a microscope, with subtypes including collagenous colitis and lymphocytic colitis

Indeterminate Colitis: When symptoms and test results don’t clearly indicate either Crohn’s or ulcerative colitis

IBD-unclassified (IBD-U): Cases that have features of both Crohn’s disease and ulcerative colitis

What is IBS?

Irritable Bowel Syndrome (IBS) is different. Medical professionals refer to it as a “functional disorder”. While there is no visible inflammation or damage, the intestines’ function is impaired.

IBS Specific Symptoms

  • Pain improves after bowel movements
  • Symptoms triggered by specific foods or stress
  • Mucus (but not blood) in stool
  • More predictable symptom patterns

IBD Specific Symptoms

  • Blood in stool
  • Unintentional weight loss
  • Fever during flare-ups
  • Anemia (low red blood cells)
  • Abdominal pain that doesn’t improve after bowel movements
  • Weight loss related to malnutrition or malabsorption

IBD and IBS Symptoms

  • Abdominal pain and cramping
  • Diarrhea and urgency
  • Fatigue
  • Constipation (more common in IBS)

How IBS and IBD Differ

Physical Changes
  • IBD causes visible inflammation and damage that doctors can see during procedures
  • IBS doesn’t cause any visible damage – your intestines look normal, but don’t function normally
Diagnosis
  • IBD requires blood tests, stool samples, and procedures like colonoscopies to see the inflammation
  • IBS is diagnosed based on your symptoms after ruling out other conditions
Progression
  • Without treatment, IBD can get worse over time and lead to serious complications
  • IBS doesn’t cause structural damage, though symptoms may come and go

IBD Treatment

  • Anti-inflammatory medications
  • Immune system suppressors
  • Biologic therapies that target specific proteins in the immune system
  • Surgery may be needed in severe cases
  • Regular monitoring with colonoscopies and blood tests

IBS Treatment

  • Dietary changes
  • Stress management techniques
  • Medications targeted at specific symptoms (diarrhea or constipation)
  • Rarely requires hospitalization or surgery
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Managing IBD

  • May follow cycles of flares (active symptoms) and remission (symptom-free periods)
  • Requires close medical monitoring
  • Could require hospitalization during severe flares
  • Might involve surgery at some point
  • Management of potential side effects from long-term medication use may occur
  • Regular screenings for colon cancer may be recommended
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Living with Digestive Disorders

Whether you’re dealing with IBD or IBS, these strategies can help:

  • Work closely with your healthcare providers
  • Identify and avoid food triggers
  • Manage stress effectively
  • Consider joining support groups
  • Keep track of your symptoms
  • Stay well-hydrated
  • Follow your treatment plan consistently
smiling-nurse

When to See a Provider

These could indicate IBD or other serious conditions that need prompt attention. See a provider immediately if you have:

  • Blood in your stool
  • Unintentional weight loss
  • Severe abdominal pain
  • Persistent fever
  • Symptoms that wake you from sleep
  • Signs of dehydration
  • Significant changes in bowel habits or stool consistency over time

Let’s Connect

Are you ready to explore whether infusion therapy could help manage your gastrointestinal conditions? Ask your provider about a referral to Soleo Health, or contact us today. 

Disclaimer: This information is educational and not a substitute for professional medical advice. Always consult with your healthcare provider regarding the diagnosis and treatment of any health condition.