Leaky Gut vs SIBO: Which One Is Really Behind Your Symptoms?

Joan Haynes • February 16, 2026

You've been dealing with bloating, fatigue, and digestive issues for months: maybe even years. You've tried cutting out gluten, dairy, and sugar. You've taken probiotics. You've Googled your symptoms at 2 AM.

And you keep seeing two terms pop up: Leaky Gut and SIBO.

But which one do you actually have? And does it even matter?

Here's the thing: it absolutely matters. Because treating the wrong condition means you'll keep spinning your wheels, trying random supplements and restrictive diets that don't address what's actually going on in your gut.

Let's break down the difference between these two common (and often overlapping) gut issues: and help you figure out which one might be behind your symptoms.

What Is Leaky Gut?

Leaky gut, also called intestinal permeability, happens when the lining of your small intestine becomes damaged and porous. Think of it like a screen door that's supposed to keep bugs out: but now it's full of holes.

When your gut lining is compromised, things that shouldn't be in your bloodstream: like undigested food particles, bacteria, and toxins: slip through those gaps. Your immune system sees these invaders and goes on high alert, triggering inflammation throughout your body.



Common Leaky Gut Symptoms

If you have leaky gut, you might experience:

  • Chronic bloating and gas
  • Constipation or diarrhea (or both)
  • Food sensitivities that seem to multiply
  • Brain fog and difficulty concentrating
  • Fatigue that doesn't improve with sleep
  • Skin issues like acne, eczema, or rashes
  • Joint pain or stiffness
  • Mood swings or anxiety

Notice how many of these symptoms happen outside your digestive system? That's because leaky gut triggers systemic inflammation: it affects your whole body, not just your gut.

What Causes Leaky Gut?

Your gut lining can break down from:

  • Poor diet (high in sugar, processed foods, and inflammatory oils)
  • Chronic stress (cortisol damages the gut barrier)
  • Medications like NSAIDs, antibiotics, and PPIs
  • Alcohol consumption
  • Infections and imbalances in gut bacteria
  • Autoimmune conditions

What Is SIBO?

SIBO stands for Small Intestinal Bacterial Overgrowth. It's exactly what it sounds like: bacteria that belong in your large intestine migrate up into your small intestine, where they don't belong.

These bacteria ferment the food you eat (especially carbohydrates and fiber) and produce gas. A lot of gas. This leads to that uncomfortable, distended belly feeling: often within 30 minutes to 2 hours after eating.



Common SIBO Symptoms

SIBO symptoms include:

  • Severe bloating (especially after meals)
  • Abdominal pain or cramping
  • Diarrhea, constipation, or alternating between both
  • Excessive gas and belching
  • Nausea
  • Nutrient deficiencies (even if you're eating well)
  • Fatigue and weakness
  • Brain fog

Sound familiar? That's because SIBO and leaky gut share a lot of the same symptoms. But there's one major clue that points to SIBO: bloating that gets worse after eating, especially after meals with fiber or fermentable carbs.

What Causes SIBO?

SIBO develops when your gut's natural defenses break down. Common triggers include:

  • Low stomach acid (from stress, aging, or medications)
  • Slow gut motility (from chronic stress, thyroid issues, or diabetes)
  • Structural issues like adhesions or diverticula
  • Antibiotic use (which wipes out good bacteria)
  • IBS or chronic constipation

The Connection Between Leaky Gut and SIBO

Here's where it gets tricky: you can have both at the same time.

In fact, they often feed into each other. SIBO can cause leaky gut because the bacterial overgrowth damages your intestinal lining. And leaky gut creates an environment where SIBO can thrive because your gut's immune defenses are compromised.

It's a vicious cycle: but one that can be broken with the right approach



How to Tell the Difference

So how do you know which one you're dealing with?

Look at Your Symptom Patterns

You might have SIBO if:

  • Your bloating is extreme and happens predictably after meals
  • You feel worse after eating high-fiber foods (beans, broccoli, onions, garlic)
  • You get relief from fasting or skipping meals
  • Your symptoms improve when you avoid fermentable carbs (FODMAPs)

You might have leaky gut if:

  • You have multiple food sensitivities that keep expanding
  • You experience symptoms beyond digestion (skin issues, joint pain, brain fog)
  • You have an autoimmune condition or chronic inflammation
  • Your symptoms are more constant, not just tied to meals

Testing Can Clarify

While symptoms give you clues, testing provides answers:

  • SIBO breath test: Measures hydrogen and methane gases produced by bacterial overgrowth
  • Comprehensive stool test: Reveals gut bacteria imbalances, inflammation markers, and digestive function
  • Food sensitivity panels: Can indicate leaky gut (though not a direct test)

At Body Wellness Boutique, Dr. Joan Haynes, DNP, specializes in identifying the root causes of chronic gut issues like SIBO and leaky gut. She uses functional lab testing to get a clear picture of what's happening: so you're not just guessing.

Why a Root-Cause Approach Matters

Here's the truth: popping a probiotic or going gluten-free might help temporarily. But if you're not addressing why your gut broke down in the first place, you'll stay stuck.

A root-cause approach means:

✅ Identifying what triggered the gut dysfunction (stress, infections, medications, diet)
✅ Restoring gut barrier integrity and rebalancing bacteria
✅ Supporting digestion with enzymes, stomach acid, and motility
✅ Reducing inflammation throughout your body
✅ Creating sustainable habits that keep your gut healthy long-term

It's not about extreme diets or expensive supplements forever. It's about understanding your unique body and giving it what it needs to heal.



What Healing Looks Like

When you address SIBO and leaky gut at the root, you can finally experience:

  • A flat, comfortable belly instead of constant bloating
  • Consistent, easy digestion without cramping or urgency
  • Mental clarity and sustained energy throughout the day
  • Freedom to eat without fear or symptoms
  • Reduced inflammation and relief from body-wide symptoms

Your gut is the foundation of your overall health. When it's healed, everything else improves: your energy, mood, skin, immune system, and more.

Ready to Get Answers?

If you're tired of guessing what's wrong and ready to find out what's really behind your bloating, fatigue, and digestive struggles, you don't have to figure it out alone.

Dr. Joan Haynes specializes in helping women identify and heal chronic gut issues like SIBO and leaky gut using a personalized, root-cause approach. No cookie-cutter protocols. Just real answers and a clear path forward.

Book your free discovery call to talk through your symptoms and find out how functional testing and personalized care can help you reclaim your gut health: and your life.