When SIBO Keeps Coming Back: Looking Beyond the Overgrowth
Dr. Tracy Tranchitella ND | Sunrise Functional Medicine
Bloating after meals. Excessive gas. Abdominal discomfort. Diarrhea that seems to come and go—or constipation that never seems to fully resolve. Sometimes there is fatigue, brain fog, or the feeling that foods you once tolerated suddenly don’t agree with you.
These symptoms are common, but that doesn’t mean they’re insignificant. One possible contributor is small intestinal bacterial overgrowth, or SIBO, a condition in which excessive numbers of microorganisms are present in the small intestine, where microbial populations are normally much lower than in the colon. The resulting fermentation can interfere with digestion and contribute to gas, bloating, altered bowel habits and, in some cases, problems with nutrient absorption.
But there is another important question to ask: Why did those microorganisms overgrow in the first place? That question is often where a functional medicine approach to SIBO begins.
What happens when bacteria move into the wrong neighborhood?
The small intestine is not supposed to be sterile. It contains microorganisms, but the number and composition are normally kept under control by several protective mechanisms, including stomach acid, digestive secretions, immune function and the movement of food and intestinal contents through the gastrointestinal tract.
When those protective mechanisms are disrupted, microorganisms can accumulate where they don’t belong—or in numbers that interfere with normal digestion. The bacteria ferment carbohydrates, producing gases that can contribute to abdominal distension, bloating, belching and discomfort. Depending on the organisms involved and the gases they produce, bowel habits may also change. Hydrogen is often associated with diarrhea-predominant symptoms, while methane production is more strongly associated with constipation.
And there’s an important terminology update worth knowing: methane is produced by archaea rather than bacteria. For that reason, methane-predominant overgrowth is increasingly referred to as intestinal methanogen overgrowth, or IMO, rather than SIBO. Hydrogen sulfide is another gas that may be measured in some newer breath-testing approaches.
Is SIBO the problem—or a sign of another problem?
SIBO can certainly contribute to uncomfortable digestive symptoms, but it may also be the downstream result of something else affecting the gastrointestinal tract. Normal intestinal movement is particularly important because the digestive system needs to keep food and microorganisms moving in the right direction.
Problems with intestinal motility, altered anatomy, certain digestive disorders, impaired digestive defenses and other factors can create an environment where overgrowth becomes more likely.
What does SIBO feel like?
There isn’t one universal SIBO symptom pattern, which is part of what makes the condition challenging to recognize. Common symptoms can include:
- Bloating or abdominal distension, particularly after eating
- Excessive gas or belching
- Abdominal pain or discomfort
- Diarrhea, constipation, or alternating bowel habits
- Nausea
- Changes in food tolerance
- Fatigue or brain fog
- Symptoms associated with poor digestion or nutrient absorption
The difficulty is that these symptoms overlap with irritable bowel syndrome, carbohydrate intolerance and several other gastrointestinal conditions. Symptoms alone generally aren’t enough to establish a diagnosis.
How is SIBO tested?
Breath testing is one of the most commonly used noninvasive approaches. After consuming a test substrate, usually a carbohydrate solution, a patient provides breath samples at prescribed intervals. The samples are analyzed for gases produced by microorganisms in the gastrointestinal tract.
Treatment isn’t necessarily one-size-fits-all
Once SIBO or IMO has been identified, treatment may involve antimicrobial therapy, dietary changes and strategies aimed at improving gastrointestinal function. Conventional treatment may include prescription antibiotics, while naturopathic medicine may incorporate carefully selected herbal antimicrobial agents. There is no single antimicrobial that works equally well against every microorganism. An individualized approach considers symptoms, testing results, overall health and suspected type of overgrowth.
Diet can also have an important role while restrictive diets are not necessarily meant to become a permanent solution. The goal isn’t simply to create a diet so restrictive that symptoms disappear. The goal is to help restore a healthier and more sustainable digestive environment.
What if you’ve already treated SIBO and it came back?
This is where it may be especially helpful to step back and reconsider the bigger picture. Recurring SIBO can be frustrating because it can feel as though treatment “worked”—until it didn’t. Recurrence is common enough that the underlying contributors deserve closer attention as well.
A healthier gut is more than a symptom-free gut
Gut health isn’t simply about eliminating every bacterium that might be considered undesirable. The gastrointestinal tract is a complex ecosystem, and health depends on balance, appropriate microbial diversity, normal digestive function and effective movement through the digestive system.
SIBO can be an important piece of that puzzle—but it isn’t the whole puzzle. For people struggling with persistent bloating, unexplained changes in bowel habits, food intolerance or recurring digestive symptoms, getting a clearer picture of what is happening can be an important first step. Rather than continually chasing individual symptoms, a naturopathic and functional medicine approach can look at the interconnected factors that may be contributing to the problem.
Ready to improve your digestive health?
If persistent digestive symptoms are interfering with your quality of life—or if you’ve treated SIBO before only to have symptoms return—Dr. Tranchitella, ND can help you take a closer look at the factors that may be contributing to your digestive health.
A personalized evaluation may include functional testing when appropriate, nutritional assessment and an individualized plan designed around your symptoms, health history and underlying needs. The goal isn’t simply to manage one more digestive symptom, but to understand what your body may be telling you and develop a thoughtful path forward. To learn how a whole-person approach to your healthcare can help you better understand your health, and to discover a plan that is right for you. Schedule a consultation today >> LEARN MORE