Is Small Intestine Bacterial Overgrowth (SIBO) contagious?

Small Intestine Bacterial Overgrowth (SIBO) is not contagious and cannot be spread from person to person through touch, droplets, or casual contact. It is a functional and physiological disorder occurring within your own digestive tract, meaning you pose no risk to friends, family, or coworkers by living with SIBO.

What actually causes Small Intestine Bacterial Overgrowth (SIBO)?

Small Intestine Bacterial Overgrowth (SIBO) occurs when there is an abnormal increase in the overall bacterial population in the small intestine, specifically types of bacteria not commonly found in that part of the digestive tract. Rather than an infection passed between individuals, Small Intestine Bacterial Overgrowth (SIBO) is typically caused by underlying structural or motility issues. These may include slow gut transit (motility disorders), anatomical abnormalities, or chronic conditions that disrupt the body's natural ability to keep the small intestine clean.

Why is there confusion regarding the contagiousness of Small Intestine Bacterial Overgrowth (SIBO)?

The confusion often stems from the word "bacterial" in the name. Because many illnesses involving bacteria—such as the flu or strep throat—are infectious, people mistakenly assume Small Intestine Bacterial Overgrowth (SIBO) follows the same transmission patterns. However, SIBO is an internal imbalance of the body's own microbiome, not an external pathogen invasion.

Are there environmental factors related to Small Intestine Bacterial Overgrowth (SIBO)?

While Small Intestine Bacterial Overgrowth (SIBO) is not contagious, certain environmental or lifestyle factors can contribute to its development, including:

• History of food poisoning (post-infectious IBS).


• Use of medications that slow gut motility, such as opioids or certain acid-suppressants.


• Prior abdominal surgeries that may cause adhesions or strictures.


• Chronic conditions like diabetes or scleroderma that affect nerve function in the gut.

Next steps

• Consult a gastroenterologist to identify the underlying cause of your Small Intestine Bacterial Overgrowth (SIBO).


• Connect with the 30 members of our DiseaseMaps.org community to share experiences and coping strategies.


• Focus on nutritional support and motility-enhancing protocols recommended by your clinical team.

Medical Disclaimer: This content is for informational purposes only and does not constitute professional medical advice, diagnosis, or treatment; always seek the advice of your physician regarding a medical condition.

References

• National Institutes of Health (NIH) - Genetic and Rare Diseases Information Center (GARD)


• American College of Gastroenterology (ACG) Clinical Guidelines


• PubMed: "Small Intestinal Bacterial Overgrowth: A Comprehensive Review"


• International Foundation for Gastrointestinal Disorders (IFFGD)