SIBO Symptoms: How to Recognize Them and Why You Shouldn’t Ignore Them

Many people live for years with digestive discomfort without realizing that the root cause may be SIBO (Small Intestinal Bacterial Overgrowth). Recognizing symptoms early is key to improving quality of life and preventing the issue from becoming chronic. In this article, we explain the most common symptoms of SIBO, why they occur, and when it’s advisable to consult a healthcare professional.

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What Is SIBO?

SIBO happens when there is an excessive growth of bacteria in the small intestine, an area that normally has relatively low bacterial levels. These bacteria ferment food too early, producing gas, inflammation, and poor nutrient absorption.

Most Common Digestive Symptoms

Symptoms vary from person to person, but the most frequent include:

Abdominal bloating (especially after eating)
Visible abdominal distention
Excessive gas
Diarrhea, constipation, or alternating between both
Abdominal pain or discomfort
A feeling of slow or heavy digestion

Often these symptoms worsen after eating foods high in FODMAPs.

Extra-Digestive Symptoms

SIBO doesn’t just affect the gut — it can also cause:

Persistent fatigue
Headaches
Difficulty concentrating
Nutritional deficiencies
Mood changes

These non-digestive symptoms occur because poor absorption impacts the entire body.

Why SIBO Causes So Many Symptoms

Bacteria produce gases when they ferment food. These gases create pressure and inflammation, disrupt normal intestinal movement, and can interfere with the absorption of essential vitamins and minerals.

What to Do If You Recognize These Symptoms

If several of these symptoms sound familiar:

Consult a healthcare professional
Discuss the possibility of a SIBO breath test
Start adjusting your diet to reduce bacterial fermentation

Early action can make a big difference in how you feel over time.

Frequently Asked Questions

Can I have SIBO without all the symptoms?
Yes — some people only experience bloating or gas.

Do symptoms occur every day?
Not always — but they often repeat after meals.