Small intestinal bacterial overgrowth (SIBO) is defined as an increase in the number and/or an alteration in the type of bacteria in the small intestine.
Intestinal methanogen overgrowth (IMO) refers to an excessive build up of methanogenic microbes (also called archaea) in the small or large intestine.
Common symptoms include abdominal bloating (very common) and pain, flatulence, an altered bowel habit, nausea and food/nutrient malabsorption. Various health conditions and disease states can cause impairment of a number of protective mechanisms resulting in SIBO and IMO.
SIBO and IMO are challenging to formally diagnose. Hydrogen and methane breath testing can be used in suspected cases however the reliability of these tests needs to be considered. SIBO and IMO may be suspected if there is a positive breath test in conjunction with other clinical information (e.g. the presence of risk factors, known dietary triggers and typical symptom profile).
Antibiotics are often used as first line therapy in addition to dietary modifications, selective supplements and lifestyle strategies. Alternative treatment options are often considered in case of IMO. Relapse is common, highlighting the need to investigate underlying factors that may increase the development of SIBO and IMO.
At GutCode, we don’t prescribe antibiotics or herbal antimicrobials for SIBO treatment, but we work closely with gastroenterologists and naturopaths who can. Our role is to identify SIBO, manage symptoms through diet and lifestyle changes, optimise the lower gut microbiome, investigate underlying causes, and implement strategies to reduce relapse risk. For IMO, we provide both treatment and long-term relapse prevention strategies to support lasting gut health.