IBS & SIBO NATUROPATH · MAROOCHYDORE, SUNSHINE COAST & TELEHEALTH
IBS vs SIBO
What's the Difference?
Why the symptoms overlap, and when testing may help clarify the next step
Bloating, abdominal discomfort, constipation, diarrhoea and changes in food tolerance can occur with both IBS and SIBO.
This overlap leads many people diagnosed with IBS to wonder whether bacterial overgrowth may also be contributing.
You do not need to know which condition you have before booking.
IBS and SIBO can look similar, but they are not the same
The symptoms overlap considerably, which is why the distinction is not always obvious from symptoms alone.
IBS
Irritable Bowel Syndrome describes a pattern of abdominal pain and altered bowel habits when another condition does not better explain the symptoms.
Symptoms may include:
Abdominal pain or discomfort
Diarrhoea
Alternating bowel habits
Bloating or visible distension
Urgency or incomplete evacuation
Standard investigations may be normal, which can leave people still wondering what is driving them.
SIBO and IMO
Small Intestinal Bacterial Overgrowth refers to excessive or altered bacterial populations in the small intestine that are associated with digestive symptoms.
Commonly reported symptoms include:
Methane detected on breath testing is described as intestinal methanogen overgrowth, or IMO, and is particularly relevant when constipation is prominent.
When SIBO may be worth considering
SIBO may be worth investigating when symptoms such as bloating, abdominal discomfort or altered bowel habits persist despite an IBS diagnosis or previous treatment.
The history matters too. Previous gastrointestinal infection, altered gut motility, constipation, abdominal surgery or recurrent symptoms after treatment may change how the picture is assessed.
The presence of these factors does not confirm SIBO, but they can help determine whether breath testing is worth considering.
That is consistent with current guidance that SIBO symptoms are nonspecific and testing should be interpreted in clinical context.
Why the distinction matters
IBS and SIBO can produce similar symptoms, but the next step may not be the same.
If the main issue is an IBS or broader gut–brain interaction pattern, management may focus on bowel function, food tolerance, symptom triggers and other contributors.
If SIBO or IMO is genuinely part of the picture, identifying it may change the way treatment is approached.
The point is not to find a more complicated diagnosis. It is to avoid treating two different presentations as though they are automatically the same.
IBS is classified as a disorder of gut–brain interaction, while SIBO refers to a different clinical entity involving changes in the small-intestinal bacterial population; overlap can occur, but one does not simply equal the other.
TESTING
When SIBO testing may be useful
Breath testing can help distinguish SIBO or IMO from other explanations for similar digestive symptoms, but it is not automatically needed because someone has bloating or an IBS diagnosis.
The result should change what happens next
I consider testing when the symptom pattern and history make SIBO or IMO plausible and knowing the result would influence the treatment approach.
Previous breath tests, treatments and how symptoms responded are also useful to review before deciding whether repeating or undertaking testing is worthwhile.
MY APPROACH
Looking at the whole digestive pattern
Persistent bloating, altered bowel habits or an IBS diagnosis do not automatically mean SIBO is the explanation.
I look at the broader pattern before deciding what deserves attention next.
The aim is not to replace one broad label with another. It is to work out what appears most relevant now.
01 — Clarify the symptom pattern
When symptoms began, how they relate to meals and bowel movements, and what is affecting you most now.
02 — Review what has already been done
Previous pathology, breath testing, dietary approaches, supplements, medications and how you responded.
03 — Decide what needs clarification
Consider whether SIBO or IMO testing is likely to add useful information, or whether another digestive pathway makes more sense.
04 — Build the next step
Develop a focused plan based on the most relevant findings rather than treating every possible explanation at once.
You do not need to know whether it is IBS or SIBO before booking
You may already have an IBS diagnosis, be wondering whether SIBO should be investigated, or have had previous SIBO treatment without lasting improvement.
Your initial consultation is used to review the pattern, what has already been investigated and whether further testing or a different digestive approach is likely to be useful.