If you’ve been treated for SIBO but your symptoms never fully went away, or they did, only to come raging back, I want you to know there is hope. Relapsing SIBO is incredibly common and frustrating, but it is fixable. You just need to identify your root cause.
The #1 Mistake in Treating SIBO That Keeps You Stuck
Here’s the biggest mistake I see: people treat SIBO like a one-time infection, not a symptom of a deeper dysfunction. That mindset is what keeps you stuck in a cycle of relapse.
In this article, I’m breaking down the most overlooked reasons why SIBO keeps coming back, and more importantly, what you need to do to finally break the cycle.
I’ll cover the four different types of SIBO, including the ones most people miss, and why treating SIBO isn’t just about killing bacteria — it’s about healing your entire gut ecosystem.
I’m Amanda, a registered dietitian with a Master’s in Nutrition and Functional Medicine. And I’ve been exactly where you are. After years of relapsing SIBO and failed treatments, it was understanding my root cause that finally helped me heal.
Prefer to watch? Here’s the video version of this post.
Understanding the 4 Different Types of SIBO and SIFO
Not all SIBO is the same.
SIBO stands for Small Intestinal Bacterial Overgrowth, but not all overgrowths are bacterial.
Lumping everything under one label actually obscures the path to healing because it is the type of overgrowth you have that affects your symptoms, your treatment, and your risk of relapse.
Hydrogen-Dominant SIBO
This is one of the most common forms. It typically causes diarrhea because hydrogen gas speeds up motility, causing food and waste to move through your system more rapidly. Hallmark symptoms include bloating, gas, and urgency after meals.
It’s often triggered by food poisoning, which can damage the Migrating Motor Complex (MMC) — the mechanism that keeps your small intestine clear of bacterial overgrowth. More on that later.
Methane-Dominant SIBO
This isn’t caused by bacteria; it’s caused by archaea, which produce methane gas. Methane slows motility and causes severe constipation that doesn’t respond well to eating more fiber or taking magnesium supplements. It’s frustrating, stubborn, and very common.
Hydrogen Sulfide SIBO
This one typically causes diarrhea and often comes with severe abdominal pain, painful trapped gas, and that telltale rotten egg smell. It can trigger brain fog, cystic acne, and anxiety. It shows up more often in people with detoxification issues or and is often referred to as the “canary in the coalmine of toxicity”.
SIFO: Small Intestinal Fungal Overgrowth
This type is fungal, not bacterial. And it can co-occur with any of the other types. It typically causes constipation, intense sugar cravings, and bloating. If you’ve had multiple rounds of antibiotics, taken prednisone, or have mold exposure, you’re more at risk.
Identifying Your Root Cause to Stop the Cycle
After identifying the type of SIBO you have, the next most crucial step is uncovering what caused it to develop in the first place. If you skip this step, your risk of relapse increases.
My root cause was a severe episode of food poisoning in Costa Rica. Followed by a heavy-duty course of antibiotics that caused post-infectious IBS. As you can see below, there are many causes of SIBO. Identifying yours will help you stop relapsing by giving you a clear path to fixing the root cause.
What Actually Causes SIBO?
It’s not just about bacterial overgrowth. SIBO happens because something deeper in your digestive function has broken down.
Let’s take a quick tour through the gut:
The small intestine is where nutrient absorption happens.
Your large intestine is where your microbiome lives.
The small intestine isn’t sterile, but it doesn’t have a large amount of bacteria present, the way the large intestine does.
What keeps it that way is the Migrating Motor Complex (MMC), a powerful nerve-driven cleansing wave that sweeps bacteria and debris out between meals and throughout the night. When that cleansing wave stalls (often after food poisoning or certain infections), bacteria overgrow in the small intestine, leading to symptoms.
If you only kill the overgrowth but don’t restore this cleansing wave or address your root cause, it’s only a matter of time before the symptoms come back.
Why Prokinetics Matter
Prokinetics help stimulate the MMC and restore the cleansing wave. There are multiple options, but my favorite is Motilpro by Pure Encapsulations.
Of course, Motilpro isn’t suitable for everyone, especially if you’re taking an SSRI, as it contains 5-HTP, which is contraindicated. This is where personalized care really matters.
Not everyone with SIBO has MMC damage. That’s where testing comes in.
If you want to check for MMC damage, the IBS Smart Test is one of the best tools we have. It checks for antibodies that can damage the nerves driving this process.
If those antibodies are high, you’ll want to be more proactive about using a prokinetic during and after SIBO treatment. If they’re not, your overgrowth may have more to do with a different root cause than autoimmunity.
The 5 Steps to Clear SIBO for Good
So how do we break the cycle and clear SIBO for good? Not by staying on the low-FODMAP diet forever.
There’s a specific sequence that works, and it’s the framework I use with every client because real healing doesn’t stop at symptom relief. SIBO disrupts gut function on multiple levels, and we have to repair all of them if we want lasting results.
Step 1: Clear the Overgrowth
There are two common misconceptions about this step. First, clearing SIBO isn’t one-size-fits-all. The type of overgrowth you have determines the treatment, so blanket protocols that use the same antibiotic or herbal blend for everyone rarely work.
Second, clearing SIBO takes time, especially with herbal antimicrobials. In fact, one study found that herbal therapy was more effective than the antibiotic Rifaximin, with a 46% success rate in normalizing breath tests compared to just 34% in the antibiotic group¹.
And another study showed that some participants didn’t clear their overgrowth until week 6, with a few even testing positive again at weeks 10 or 14². If you go just by symptoms and skip retesting, you risk missing lingering overgrowth, and that’s one of the biggest drivers of relapse.
More severe cases often take two months or more to fully clear. I know that might feel like a long time, especially if you’ve been told SIBO can be wiped out in 14 days. But this isn’t about short-term symptom relief. It’s about clearing the overgrowth, so you don’t have to keep coming back to square one.
Step 2: Heal the Gut Lining
Once the overgrowth is cleared, we repair the gut lining with nutrients such as L-glutamine, zinc carnosine, and butyrate. This reduces inflammation and discomfort.
Healing the gut lining takes at least 8 weeks of consistent support. One thing to watch out for — if you’re taking NSAIDs like ibuprofen during this phase, it can slow healing by increasing intestinal permeability.
Step 3: Rebuild the Microbiome
Long-term restrictive diets and antimicrobials often deplete your beneficial microbes. We gently reintroduce prebiotic fibers to support your butyrate producers, Bifidobacteria, and Akkermansia — all key players in gut health.
These don’t bounce back overnight. In fact, it can take 12–18 months to restore a severely depleted microbiome.
Step 4: Restore Immune Tolerance
This step is one of the most overlooked, but it’s a game-changer.
If your immune system is still reacting to harmless foods, it’s not just frustrating; it’s a sign your gut barrier and immune tolerance haven’t fully recovered.
To rebuild that tolerance, we focus on increasing butyrate production (which helps calm immune reactivity) and, when appropriate, adding immunoglobulins to retrain your immune system to stop tagging safe foods as threats.
This is what helps clients move from “I can only eat five foods” to finally tolerating a diverse diet again.
Step 5: Reintroduce Foods
This step is critical — and often skipped. Once your gut is stable, we reintroduce previously reactive foods slowly, with support.
Therapeutic diets like low FODMAP are helpful in the short-term for symptom relief (they do not clear SIBO), but staying on them too long starves your microbiome and limits healing. This step is about reclaiming food freedom and fueling long-term gut health.
So what happens when you follow these steps?
Let me show you what’s possible.
On the left, this is where so many people start—stuck in food fear, relying on restrictive diets just to manage symptoms, feeling bloated, constipated, crampy, and exhausted more often than not.
That’s an inflamed gut. And if that’s where you are right now, it’s okay. It just means your gut needs support.
But on the right? That’s the goal.
Eating a wide variety of foods without symptoms.
Having 1–2 easy, complete bowel movements a day without even thinking about it. No more constipation. No more urgent trips to the bathroom.
Most importantly, you feel good in your body again.
This is what it takes to stop the cycle
Not another round of Rifaximin or Neomycin. Not another year on low FODMAP. But a step-by-step strategy that restores digestive function.
That’s how you finally get off the SIBO rollercoaster. That’s how you start to feel like yourself again.
If you’re ready for more than symptom management and want a personalized plan to heal your gut, schedule a free strategy session to see if we’re a good fit to work together.
Need support now? Download my free Constipation Relief guide to get things moving.
Citations
1. Chedid V, Dhalla S, Clarke JO, et al. Herbal therapy is equivalent to rifaximin for the treatment of small intestinal bacterial overgrowth. Global Adv Health Med. 2014;3(3):16-24. doi:10.7453/gahmj.2014.019
2. Cozzolino D, et al. An oral botanical supplement improves small intestinal bacterial overgrowth. Nutrients. 2023;16(18):3149. doi:10.3390/nu16183149