Patient information
What is SIBO? An introduction
SIBO stands for small intestinal bacterial overgrowth. It refers to an excess of bacteria in the small intestine, where they can interfere with normal digestion.
By Innovative Edge Consulting (site operator) · Updated
Educational content. Not independently reviewed by a clinician. Editorial standards
What changes in SIBO?
Bacteria normally exist throughout the digestive tract. SIBO concerns an excess in the small intestine, not the mere presence of bacteria. It can be associated with conditions or anatomical changes that affect movement through the gut.
Symptoms need context
People may experience bloating, gas, abdominal discomfort, or diarrhea. These experiences are not specific to SIBO. Unexplained weight loss or persistent symptoms deserve clinical attention rather than an online diagnosis.
SIBO and IMO are different
IMO involves methane-producing archaea, rather than bacterial overgrowth. It can involve the small or large intestine and is often associated with constipation. The terms should not be used interchangeably.
How is it evaluated?
A clinician considers symptoms, history, and relevant tests. Breath tests measure gases after a test solution is consumed; results need clinical interpretation. Testing has limitations. A symptom quiz cannot confirm or exclude SIBO.
Treatment is individualized
Clinical treatment may involve addressing an underlying cause, nutritional problems, and antibiotics when appropriate. Diet changes may help symptoms but are not an established cure for overgrowth. Do not choose a treatment based on a quiz.
Choose a useful next step
Read the symptoms and quiz-limitations guides, or prepare questions for a healthcare appointment. The educational quiz is available if it helps you reflect. No quiz result is required to ask for care.
Sources and further reading
- American Gastroenterological Association: SIBO patient information ↗
- American Gastroenterological Association: intestinal methanogen overgrowth ↗
- Mayo Clinic: SIBO symptoms and causes ↗
- Mayo Clinic: SIBO diagnosis and treatment ↗
Sources checked October 11, 2026. These organizations did not review or endorse this website.