Do you suffer from bloating, gas, or recurrent abdominal pain?

Small intestinal bacterial overgrowth is a frequent digestive alteration that occurs when bacteria present in the gastrointestinal tract prematurely ferment carbohydrates in the small intestine.

Under normal conditions, most bacterial fermentation occurs in the colon.
However, when this activity shifts or intensifies in the small intestine, it can
generate abnormal gas production and persistent digestive symptoms.

Therefore, in many cases, discomfort does not depend exclusively on the food ingested, but on how and where its fermentation occurs.

What happens in the intestine when SIBO is present?

The small intestine is primarily designed for the digestion and absorption of nutrients. Its physiological bacterial load is limited compared to the large intestine.

When bacterial overgrowth occurs:

Early fermentation of carbohydrates increases.
Excessive gas production is generated.
Intestinal motility is altered.
Absorption of certain nutrients may be compromised.

The bacteria involved can produce different gases, mainly:

🔹Hydrogen

Generally associated with accelerated intestinal transit and a
predominant symptom pattern of diarrhea.

🔹Methane

More related to the slowing of intestinal transit and constipation, due
to its modulating effect on motility.

Identifying the predominant gas provides relevant clinical information, as it allows for a better understanding of the patient's symptomatic pattern and guides therapeutic management more precisely.

Most frequent clinical manifestations

SIBO can present with symptoms such as:

Recurrent abdominal distension.
Feeling of heaviness after light meals.
Frequent intestinal gas.
Abdominal pain.
Alterations in intestinal rhythm (diarrhea, constipation, or mixed pattern).
Worsening of symptoms in stressful situations.

These symptoms often become chronic when the underlying origin is not
identified.

How is it diagnosed? The SIBO breath test The SIBO

The SIBO breath test is a non-invasive diagnostic test that allows for the indirect evaluation of intestinal bacterial activity.

The procedure consists of:

1. Ingestion of a specific substrate (such as lactitol).
2. Serial collection of exhaled air samples.
3. Measurement of exhaled hydrogen and methane levels.

If early fermentation exists in the small intestine, a significant increase in these gases will be observed in the early stages of the test.

This analysis allows to:

Directly evaluate hydrogen and methane production.
Identify the predominant fermentation pattern.
Provide objective information for clinical decision-making.

Why is it important to identify the predominant type of gas?

Not all SIBO cases present the same clinical behavior.

Determining whether hydrogen or methane production predominates allows to:

Correlate results with symptoms.
Guide the choice of specific antibiotic treatment.
Adjust dietary strategies.
Assess the need for probiotics or other complementary interventions.

In this sense, the test not only confirms or rules out the presence of bacterial overgrowth but also facilitates a personalized approach.

A non-invasive test with relevant clinical utility

The SIBO breath test is a safe, simple, and accessible diagnostic tool that avoids unnecessary invasive procedures.

Performing it allows to:

Objectify clinical suspicion.
Explain persistent digestive symptoms.
Reduce prolonged empirical treatments.
Establish targeted therapeutic strategies.

Conclusion

SIBO is a common digestive alteration that can be behind symptoms
that many people normalize for years.

Understanding that, at times, it is not what is eaten, but how it ferments in the intestine, is key to correctly approaching the diagnosis.

The SIBO breath test constitutes a reliable diagnostic tool that evaluates intestinal bacterial activity and provides essential information for proper and personalized clinical management.

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