I want to preface this by saying a majority of people with IBS aren’t ignoring warning signs because they’re careless. They’re ignoring them because they’ve been told everything is fine. Normal colonoscopy. Normal bloods. Here’s a food list. Off you go.
And then years pass, and they’re still planning their days around the nearest bathroom.
Below, I walk through five red flags that IBS patients, and honestly a lot of GPs, commonly miss. Many of these are signs that your current plan isn’t good enough, and what you can do about it.
Here’s a video we made; there is also a written version underneath.
Red Flag 1: Your Symptoms Are Changing or Getting Worse
IBS tends to be variable, but most people develop a sense of their pattern over time. If your symptoms have genuinely shifted — new kinds of pain, different bowel habits, something that feels qualitatively different to your usual IBS — that’s information, not noise.
“This feels different to my usual IBS” is itself a useful clinical signal. It doesn’t always mean something serious is happening. But it’s the kind of change that warrants a conversation with a doctor rather than self-managing with the same tools that have always worked before.
This is especially relevant if you’re over 50, or if there’s a family history of colorectal cancer or IBD in your family. The threshold for investigation should be lower in those situations.
Summary: A genuine shift in your usual IBS pattern like different pain, different bowel habits, or anything that feels new, is a signal worth raising with a doctor rather than managing with your usual tools. This matters even more if you’re over 50 or have a family history of colorectal cancer or IBD.
Red Flag 2: Symptoms That Wake You From Sleep
This could potentially be a medical red flag.
One of the clinical markers doctors use to differentiate IBS from IBD or other structural problems is whether symptoms are present at night. IBS-type pain and urgency typically improve at rest and don’t routinely wake people from sleep. When they do — when diarrhea or pain is regularly dragging you out of sleep — that warrants investigation.
It’s not that IBS patients never have disrupted sleep. Many do. But if it’s happening frequently and consistently, it changes the picture enough that it should be part of the conversation with a doctor.
Summary: IBS symptoms typically settle at rest and don’t regularly interrupt sleep. If pain or diarrhea is consistently waking you at night, that’s a pattern worth flagging to your doctor, since it can help distinguish IBS from other conditions.
Red Flag 3: You’ve Done Low FODMAP Multiple Times and Keep Relapsing
If you’ve completed a proper low FODMAP process — elimination, reintroduction, the whole cycle — more than once, and you keep getting the same result (some relief during the strict phase, then symptoms creeping back on reintroduction, then back to restriction again), that pattern is telling you something important.
It’s not telling you to do another low FODMAP cycle. It’s telling you that food is probably not the whole picture, or that the underlying driver of your symptoms hasn’t been properly identified yet.
We see this all the time. Someone has done FODMAP three or four times. Their safe-food list gets a little shorter each time. Their confidence in eating gets lower each time. And the underlying condition — whether it’s a motility issue, a vagus nerve sensitivity pattern, bacterial overgrowth, bile acid diarrhea, or something else — never gets properly addressed, because the assumption was always that the food list just needed tweaking.
Repeating the same plan and expecting a different result is a red flag that the plan needs rethinking, not repeating.
Summary: Relapsing after multiple rounds of low FODMAP isn’t a sign to try it again. Instead, it’s a sign that food likely isn’t the whole story, and the real underlying driver (motility, nervous system sensitivity, bacterial overgrowth, and more) hasn’t been identified yet.
If you’re just getting started, download our low FODMAP Food List Guide to get clarity on common food triggers
Tap the blue button below to download our “Eat This, Not That” list as well as additional resources for IBS (it’s free!)
Red Flag 4: You Were Labelled IBS but Never Had the Right Tests for Your Subtype
An IBS diagnosis is often made correctly, but sometimes it’s made by exclusion without enough exclusion. And the tests that should be standard vary depending on your specific symptoms.
A 2019 clinical review recommended that all suspected IBS patients should have coeliac disease serology done — a blood test (1). Coeliac disease can look almost identical to IBS in terms of bloating, diarrhea, and abdominal pain, and it’s missed more often than it should be.
If your symptoms are predominantly diarrhea (IBS-D), a test called fecal calprotectin can help distinguish IBS from IBD. It’s a stool test, not a colonoscopy, and it’s a reasonable first step before more invasive investigation. You can do a test like this from the comfort of your own home and just mail in the sample — this is something we help organize with our clients.
Then there’s the SIBO breath test to consider as well, again something you can do at home. This looks for fermentation occurring further up your digestive tract — not in your large intestine at the end of the tract, but in your small intestine, further up, after food passes through your stomach. There’s a certain set of symptoms that determine if this is worthwhile.
So if you’ve had ongoing symptoms and these basic tests haven’t been done, that’s worth raising with your doctor. Not because something is definitely wrong, but because the right tests at the right time are what get you a clearer picture and a clearer plan.
Summary: An IBS diagnosis doesn’t always come with the full set of tests it should. Coeliac serology, fecal calprotectin (for IBS-D), and a SIBO breath test are commonly overlooked but can meaningfully clarify what’s actually going on.
Red Flag 5: Your Safe-Food List Is Getting Shorter and Food Is Becoming Frightening
This one doesn’t get spoken about enough.
If the number of foods you feel safe eating keeps shrinking, if every new food feels like a risk, if eating out is no longer possible, if you’re structuring your whole day around whether you’ll have access to a bathroom — that’s a red flag for a management pathway that has gone wrong. Even if no individual food rule you’re following seems extreme on its own.
We see this pattern in people who’ve been managing IBS alone for a long time. The food list gets more and more restricted. The anxiety around eating gets higher. And quality of life keeps dropping, not because IBS got worse, but because the approach to managing it created its own set of problems.
If this is where you are, still planning every day around the toilet, still waiting for something to change, safe-food list getting shorter, the current plan isn’t working well enough. In my opinion, that’s a signal you need a better assessment.
Summary: A shrinking safe-food list and rising food anxiety are signs the management approach itself has become the problem, not necessarily that IBS has gotten worse. This calls for reassessment, not further restriction.
What To Do With These Flags
If you identified with some of these red flags — cycling through the same diet, a shrinking safe-food list, never having had the right tests, or symptoms shifting — the answer likely isn’t a new food list or another elimination diet. It’s a proper assessment of what’s actually driving your symptoms, matched to your specific subtype and history.
That’s exactly what we built our 4-SURE pathway for. It’s a structured process that identifies whether you have the right eating pattern in place, whether the right tests have been done, and what your actual next step is based on your specific situation.
To learn more about our integrated approach, I invite you to apply for a nutrition assessment call with us. We’ll help you make sense of what’s really happening and map out the next steps to get you feeling confident again — not just temporarily avoiding symptoms, but addressing the root cause and fixing your gut issues for good.
IBS guide please. Thanks so much!