SIBO Breath Testing

Digestive symptoms are common, but persistent bloating, discomfort, and food reactions are not always a stomach problem.

SIBO, or Small Intestinal Bacterial Overgrowth, occurs when bacteria that normally belong in the large intestine migrate into the small intestine, where they interfere with digestion, absorption, and signaling. When this happens, symptoms often extend beyond the gut and can affect energy, cognition, and tolerance to foods or supplements.

SIBO is one of the most common and most overlooked contributors to chronic digestive and systemic symptoms.

What the SIBO Breath Test Measures

SIBO breath testing is a non-invasive test that measures hydrogen and methane gases in the breath after ingestion of a lactulose solution.

Humans do not produce these gases on their own. When elevated levels appear in the breath, it indicates that bacteria in the small intestine are fermenting carbohydrates too early in the digestive process.

The three-hour SIBO profile captures gas patterns over a longer period of time and is especially helpful for individuals with slower gastrointestinal transit, constipation, or mixed bowel patterns.

Symptoms Commonly Associated With SIBO

Symptoms of SIBO are often described as non-specific, which is one reason the condition is frequently missed. In practice, recognizable patterns tend to repeat.

Digestive symptoms may include bloating or visible abdominal distention that worsens throughout the day, gas or pressure shortly after eating, diarrhea, constipation, or alternating bowel patterns, abdominal discomfort or cramping, and feeling uncomfortably full after small meals.

Systemic or less obvious symptoms may include fatigue after meals, brain fog, increasing food sensitivities, poor tolerance to fiber, probiotics, or gut-healing supplements, and worsening symptoms during detox or cleansing protocols.

One of the most important clues is timing. Symptoms that begin within thirty to ninety minutes after eating often point toward small intestinal involvement rather than a large-intestine issue.

Conditions Commonly Associated With SIBO

SIBO often occurs alongside other conditions rather than in isolation. It is frequently seen in individuals with:
-irritable bowel syndrome
-inflammatory bowel disease
-celiac disease or gluten sensitivity
-diabetes or blood sugar dysregulation
-fibromyalgia
-rosacea and certain skin conditions
-Parkinson’s disease
-obesity or metabolic dysfunction.

In many cases, SIBO is not the original root cause, but it can significantly amplify symptoms and prevent progress if it is not identified and addressed.

Risk Factors That Increase the Likelihood of SIBO

Certain factors increase the likelihood that SIBO will develop or persist. These include impaired gut motility, structural or anatomical changes in the digestive tract, nervous system or organ system dysfunction, advancing age, repeated antibiotic exposure, and long-term use of acid-suppressing medications such as proton pump inhibitors.

When symptoms are present alongside these risk factors, evaluating for SIBO becomes clinically relevant.

Why Use a Breath Test for SIBO

The traditional diagnostic method for SIBO involves aspirating fluid from the small intestine and culturing it. While accurate, this approach is invasive, costly, and not practical for routine clinical use.

For this reason, breath testing is widely recommended as the most patient-friendly and functional method for evaluating SIBO. Breath testing allows assessment of bacterial activity and fermentation patterns rather than simply bacterial presence.

What SIBO Testing Helps Guide

Identifying SIBO helps guide decisions around antimicrobial strategies, motility support, dietary approaches, nutrient repletion, tolerance of probiotics or detox protocols, and addressing underlying drivers that allowed overgrowth to occur.

Management is rarely one-size-fits-all and often depends on sequencing rather than aggressive intervention.

How SIBO Fits Into My Process

I consider SIBO testing when symptoms, timing, and clinical history suggest that the small intestine may be under strain.

This test is especially important when bloating or reactions occur soon after meals, when gut-focused protocols consistently worsen symptoms, when fiber or probiotics are poorly tolerated, or when progress stalls despite appropriate foundational work.

SIBO is not something I assume. It is something I evaluate carefully, because addressing it at the wrong time can make symptoms worse rather than better.

Testing is always chosen intentionally, based on readiness, relevance, and the overall clinical picture.

Performing Laboratory

SIBO breath testing is performed through Genova Diagnostics.