SIBO vs IBS: What’s the Difference and Why It Matters
If you struggle with bloating, gas, or irregular digestion, you may have been diagnosed with Irritable Bowel Syndrome (IBS). But what many people don’t realize is that a large number of IBS cases are actually linked to Small Intestinal Bacterial Overgrowth (SIBO).
Understanding the difference between SIBO and IBS is key to finding the right treatment—and long-term relief.
What is IBS?
IBS (Irritable Bowel Syndrome) is a functional digestive disorder. This means it’s diagnosed based on symptoms rather than a clear structural or measurable cause.
Common IBS symptoms include:
Bloating
Abdominal pain
Diarrhea, constipation, or both
Changes in bowel habits
IBS is often used as a “catch-all” diagnosis when no obvious cause is found.
What is SIBO?
SIBO (Small Intestinal Bacterial Overgrowth) is a condition where bacteria overgrow in the small intestine, leading to fermentation, gas production, and digestive symptoms.
Unlike IBS, SIBO has a specific underlying mechanism and can often be identified through testing.
Key Differences Between SIBO and IBS
1. Cause
IBS: Often labeled without a clear root cause
SIBO: Caused by bacterial overgrowth in the small intestine
2. Diagnosis
IBS: Based on symptoms
SIBO: Can be tested (e.g., breath tests)
3. Treatment Approach
IBS: Symptom management
SIBO: Root-cause treatment (when properly addressed)
Can IBS Actually Be SIBO?
Research suggests that a significant percentage of people diagnosed with IBS may actually have underlying SIBO.
This is why many people:
Try multiple diets
Take supplements
Still don’t get lasting results
If the root cause isn’t addressed, symptoms often return.
Shared Symptoms of SIBO and IBS
Both conditions can cause:
Bloating (especially after eating)
Gas and distension
Abdominal discomfort
Food sensitivities
Irregular bowel movements
Because of this overlap, SIBO is often missed.
Root Causes Behind SIBO (and IBS Symptoms)
Even when diagnosed as IBS, symptoms often stem from deeper imbalances such as:
Poor gut motility
Chronic stress and nervous system dysregulation
Low stomach acid
Previous infections or food poisoning
Microbiome imbalances
Environmental factors like mold exposure
If you’re experiencing these symptoms, it’s important to address the root cause—not just manage them.
I work with clients 1:1 to identify and treat the underlying drivers of SIBO and gut issues.
Why a Personalized Approach is Essential
Whether you’ve been diagnosed with IBS or suspect SIBO, the key to healing is identifying your unique root cause.
There is no single diet or supplement that works for everyone.
A personalized approach considers:
Your symptoms
Your history
Your lifestyle
Your triggers
When to Seek Support
If you’ve been dealing with:
Chronic bloating
Ongoing digestive discomfort
“IBS” that doesn’t improve
It may be time to look deeper.
You can learn more about my personalized approach on my gut health services page, where I help clients address SIBO, IBS, and microbiome imbalances at the root.
Final Thoughts
IBS is often a label—but SIBO may be one of the underlying causes.
Understanding the difference can be the turning point in your healing journey.
Instead of managing symptoms, the goal should be to identify and address the root cause of your gut issues.