Understanding SIBO

SIBO has absolutely exploded in popularity online over the last few years. At this point, if you spend enough time on gut health TikTok or Instagram, you’ll probably start wondering if every digestive symptom somehow comes back to SIBO. And to be clear, SIBO is a real condition. For some people, it absolutely can contribute to significant GI symptoms.

But online conversations around it have gotten very oversimplified.

A lot of content makes it sound like:

• everyone with bloating has SIBO

• one breath test gives all the answers

• you just “kill the bacteria”

• and then your gut is magically fixed forever

Unfortunately, it’s usually not that straightforward.

So what actually is SIBO?

SIBO stands for small intestinal bacterial overgrowth. Normally, most of the bacteria in our GI tract live in the large intestine. With SIBO, there’s an overgrowth of bacteria in the small intestine, where bacterial levels are supposed to be much lower. Those bacteria ferment carbohydrates and produce gases like hydrogen or methane, which can contribute to symptoms.

Common symptoms

Symptoms can look a little different person to person, but common ones include:

• bloating or distension

• excess gas

• abdominal discomfort

• diarrhea

• constipation (especially with methane overgrowth)

• feeling overly full after meals

One important thing to know is that none of these symptoms are specific to SIBO.

That’s part of what makes GI issues so frustrating. IBS, constipation, pelvic floor dysfunction, food intolerances, celiac disease, stress/anxiety, gastroparesis, and a bunch of other conditions can overlap symptom-wise. So symptoms alone don’t automatically mean SIBO.

What causes it?

This is probably one of the biggest things that gets missed online. SIBO is often more of a result of something else going on rather than a completely isolated issue.

Things that can increase risk include:

• slowed gut motility

• chronic constipation

• prior GI infections

• abdominal surgeries

• diabetes-related nerve dysfunction

• certain medications

• structural changes in the GI tract

This matters because if you only focus on “getting rid of the bacteria” without addressing the bigger picture, symptoms can keep coming back.

How is SIBO diagnosed?

Most commonly through a breath test. You drink a carbohydrate solution (usually lactulose or glucose), and breath samples are collected over a few hours to measure gases like hydrogen and methane. But breath testing has limitations. Interpretation is not always straightforward, and false positives and negatives can happen.

This is part of why you’ll see so much disagreement online around SIBO diagnosis.

Some providers are extremely cautious about diagnosing it, while others diagnose almost everyone with bloating as having SIBO. The truth is probably somewhere in the middle.

Do you need to cut out tons of foods?

Usually not forever. This is one of the hardest parts of the online gut health space for me to watch because people often become terrified of food. They start cutting out more and more foods trying to “starve” bacteria, and eventually they’re eating an incredibly limited diet while still feeling anxious around symptoms.

Certain dietary approaches can help symptom management in some cases, but the goal shouldn’t be lifelong restriction. The goal is improving symptoms while keeping your diet as flexible, adequate, and sustainable as possible.

Final thoughts

SIBO is real, but it’s also nuanced. Most digestive issues are. There usually isn’t one root cause, one supplement, or one perfect protocol that fixes everything overnight.

If you’re dealing with ongoing GI symptoms, try to avoid the trap of assuming every symptom automatically means SIBO. A good evaluation looks at the full picture, not just one diagnosis floating around social media.