Small Intestinal Bacterial Overgrowth (SIBO)
Conditions
Small intestinal bacterial overgrowth (SIBO) occurs when excessive bacteria grow in the small intestine, disrupting normal digestion and nutrient absorption. The small intestine normally contains relatively low levels of bacteria compared to the large intestine. SIBO develops when bacteria that typically belong elsewhere in the digestive tract begin to multiply in the small intestine. These bacteria ferment food before it can be properly absorbed, producing excess gas and interfering with normal digestion.
Digestive symptoms
Many patients experience bloating, abdominal pain, excessive gas, diarrhea, constipation, or alternating bowel habits. Symptoms often worsen after eating and may be triggered by certain carbohydrates that are easily fermented by bacteria.
Nutrient deficiencies and systemic symptoms
SIBO can interfere with nutrient absorption, leading some patients to develop vitamin deficiencies, unexplained weight loss, fatigue, or weakness. Long-term bacterial overgrowth may affect the absorption of vitamin B12, iron, and other essential nutrients.
Underlying digestive conditions
Conditions such as irritable bowel syndrome (IBS), Crohn's disease, celiac disease, diverticulosis, and previous intestinal surgery can increase the risk of bacterial overgrowth by altering the structure or function of the digestive tract.
Reduced stomach acid and medications
Stomach acid helps control bacterial growth in the digestive system. Long-term use of acid-reducing medications or conditions that lower stomach acid production may contribute to the development of SIBO.
Slowed intestinal motility
The digestive tract relies on coordinated muscle contractions to move food and bacteria through the intestines. Conditions such as gastroparesis, diabetes, and other motility disorders can slow this process and create an environment where bacteria can accumulate.
SIBO breath test
A hydrogen-methane breath test is the most common method for diagnosing SIBO. During the test, you consume a special solution and provide breath samples at scheduled intervals. These samples are analyzed for hydrogen and methane gases produced by bacteria in the small intestine. The test is non-invasive and can often be completed at home or in the office.
Diagnosing Underlying Conditions
SIBO frequently develops as a result of another condition; your NYGA provider may recommend additional testing to identify contributing factors. Understanding the root cause helps reduce the likelihood of recurrence and supports long-term symptom management.
Antibiotic treatment
Specialized antibiotics are commonly used to reduce excessive bacterial growth in the small intestine. The type and duration of treatment depend on symptom severity and diagnostic test results.
Nutrition support and reintroducing foods
Many patients benefit from dietary modifications that reduce symptom triggers while supporting gut health. NYGA also offers nutrition counseling and nutrition telehealth services to help patients safely reintroduce foods and maintain proper nutrition during treatment.
Treating the root cause
Successful long-term management often requires addressing the condition that contributed to SIBO. This may include treating motility disorders, managing chronic digestive conditions, or adjusting medications when appropriate.
At NYGA, our physicians provide comprehensive SIBO testing, advanced diagnostic evaluations, and personalized treatment plans. Whether you're experiencing chronic bloating, unexplained digestive symptoms, or recurring gut issues, our team can help identify the cause and develop a plan for lasting relief.
Schedule an appointment with NYGA today to learn whether SIBO may be contributing to your symptoms.
Frequently Asked Questions
What are the symptoms of SIBO?
Common symptoms include bloating, abdominal pain, excessive gas, diarrhea, constipation, and changes in bowel habits. Some patients also experience fatigue and nutrient deficiencies.
What causes SIBO?
SIBO is often caused by conditions that alter digestive function, including IBS, Crohn's disease, celiac disease, gastroparesis, diabetes, and previous intestinal surgery.
How is SIBO diagnosed?
SIBO is most commonly diagnosed using a hydrogen-methane breath test, which measures gases produced by bacteria in the digestive tract.
Can SIBO come back?
Yes. SIBO can recur, especially if the underlying cause remains untreated. Patients with chronic digestive disorders, motility issues, or structural abnormalities may be at higher risk for recurrence.
Can SIBO cause vitamin deficiencies?
Yes. SIBO can interfere with the absorption of nutrients such as vitamin B12, iron, and fat-soluble vitamins, potentially leading to deficiencies over time.
Why does SIBO cause bloating and gas?
Excess bacteria ferment carbohydrates in the small intestine, producing hydrogen and methane gases that contribute to bloating, abdominal distension, and discomfort.
Do I need to change my diet if I have SIBO?
Many patients benefit from dietary adjustments during treatment. Your NYGA provider or registered dietitian can recommend a nutrition plan tailored to your symptoms and treatment goals.