Your gut microbiome is home to trillions of bacteria that help digest food, regulate your immune system, and support your overall well-being. But when these microbes grow in the wrong place—or in the wrong proportions—they can do more harm than good. This is where SIBO and dysbiosis come in.

In this guide, we’ll break down what these terms mean, how they differ, and what you can do to restore balance in your gut.

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What Is SIBO?

SIBO stands for Small Intestinal Bacterial Overgrowth. It occurs when bacteria that normally live in the large intestine (colon) migrate into the small intestine, where they don’t belong—and start fermenting your food too early in the digestive process.

Why It’s a Problem:

The small intestine is meant to be relatively sterile. When bacteria overgrow here, they ferment carbohydrates from food, creating gas, inflammation, and nutrient malabsorption.

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Common Symptoms of SIBO

SIBO symptoms often overlap with IBS and other digestive conditions:

Digestive:

•    Bloating (especially after meals)

•    Gas and belching

•    Abdominal pain or cramping

•    Diarrhea, constipation, or both

•    Nausea or reflux

•    Foul-smelling stools

Systemic:

•    Fatigue or brain fog

•    Nutrient deficiencies (especially B12, iron, and fat-soluble vitamins)