The rules for diagnosing IBS just changed — and millions of people could be affected

For years, people with chronic bloating, cramping, pressure and other digestive symptoms could face a frustrating problem: They seemed to have irritable bowel syndrome (IBS), but technically didn’t meet the criteria doctors used to diagnose it.

That may be about to change.

A major update to the international guidelines used to diagnose IBS and other digestive conditions has made the definition of IBS more inclusive — potentially allowing people who previously fell through the cracks to receive a diagnosis.

The new guidelines, known as Rome V, are the first major revision of the Rome Criteria since 2016. They affect not only irritable bowel syndrome, but also functional dyspepsia, chronic constipation, nausea and vomiting disorders and numerous other conditions collectively known as Disorders of Gut-Brain Interaction, or DGBIs.

For people living with unexplained digestive symptoms, however, one change may matter more than all the others.

You may no longer need to call it “pain” to meet the IBS criteria

IBS stomach gut pain. marselin888 via 123rf — marselin888 via 123rf

One of the most consequential changes involves a surprisingly simple word: discomfort.

Under the previous Rome IV criteria, IBS required recurrent abdominal pain. Earlier criteria had allowed patients to report abdominal “pain or discomfort,” but Rome IV removed discomfort from the definition.

That distinction turned out to matter.

Not everyone with IBS describes what happens in their abdomen as pain. Some experience pressure, cramping, fullness, bloating or an uncomfortable sensation that they simply would not call painful.

Under the stricter definition, someone could have symptoms that looked very much like IBS but still fail to meet the formal criteria.

Rome V brings abdominal discomfort back.

It also lowers the required frequency of symptoms. Instead of requiring abdominal pain at least once a week, the new clinical criteria allow abdominal pain or discomfort occurring at least three days per month.

That seemingly small change could make IBS diagnosis possible for people whose symptoms were previously considered too infrequent — or who never described them using the word “pain.”

Why doctors use the Rome Criteria in the first place

IBS can be particularly frustrating because there isn’t a single blood test, scan or colonoscopy that confirms someone has it.

Instead, clinicians generally make the diagnosis based on a characteristic pattern of symptoms while evaluating whether another condition might better explain them.

For nearly three decades, the Rome Criteria have provided an international framework for diagnosing these conditions.

Rome V also makes an important distinction between the criteria needed for research and those appropriate for treating an individual patient.

Researchers conducting a clinical trial may need narrowly defined groups of participants so they can reliably compare results. A doctor sitting across from an individual patient has a different job.

Real people don’t always fit perfectly into research categories.

Rome V gives clinicians more flexibility to use their judgment when a patient’s symptoms and history point toward a disorder even if that person doesn’t satisfy every threshold researchers might use in a study.

IBS is increasingly being treated as a biological disorder — not “just stress”

The new guidelines also reflect a larger change in how medicine understands IBS.

Conditions such as IBS were traditionally called “functional gastrointestinal disorders,” terminology that sometimes contributed to the perception that nothing was physically wrong because routine medical testing could appear normal.

Researchers now understand that these disorders can involve complicated interactions among the gastrointestinal tract, nervous system, gut microbiome, immune system, intestinal motility and communication between the gut and brain.

That’s why the preferred term has increasingly become Disorders of Gut-Brain Interaction, or DGBIs.

The distinction matters to patients who have spent years being told that their symptoms were simply caused by anxiety or that nothing was wrong because their tests were normal.

Normal imaging or bloodwork does not mean the symptoms aren’t real.

Treatment is moving beyond simply prescribing a pill

Rome V also places greater emphasis on treating IBS from several directions rather than relying exclusively on medication.

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Depending on the patient and symptoms, treatment can include medication, dietary interventions, gut-directed cognitive behavioral therapy, hypnotherapy, biofeedback and other approaches.

Diet is now explicitly recognized as part of evidence-based IBS management.

That includes the low FODMAP diet, which temporarily reduces certain fermentable carbohydrates that can trigger symptoms in some people with IBS.

Importantly, the elimination phase of a low FODMAP diet is not intended to be permanent. It is a structured process involving elimination followed by reintroduction and personalization, ideally with guidance from a dietitian trained in digestive disorders.

The larger shift is toward individualized care rather than assuming one treatment will work for everyone.

Some previously overlooked digestive disorders now have names

Rome V doesn’t only change IBS.

The new framework formally recognizes several conditions that previously lacked their own place within the Rome diagnostic system.

Among them are retrograde cricopharyngeal dysfunction, sometimes called “no-burp syndrome,” in which people are unable to belch normally; adult abdominal migraine; and anorectal sensory dysfunction.

Having a formally recognized diagnosis may sound like an academic distinction, but it can make an enormous difference for someone who has spent years seeking an explanation for unusual symptoms.

Recognition can help clinicians identify a condition, researchers study it and patients finally put a name to what they are experiencing.

Children with digestive disorders may also be affected

Image credit: JPRFPhotos via Shutterstock

Rome V substantially reorganizes the way digestive gut-brain disorders are classified in children and adolescents.

Rather than primarily separating pediatric disorders according to age, the new system places greater emphasis on where symptoms originate within the upper or lower gastrointestinal tract.

It also expands recognition of conditions involving chronic nausea, feeding difficulties, rumination, belching and air movement through the digestive tract.

The changes reflect growing evidence that gut-brain disorders can present differently throughout childhood and adolescence and may require more individualized evaluation.

What should you do if you were previously told you don’t have IBS?

The new criteria don’t mean that every case of bloating, constipation, diarrhea or abdominal discomfort is IBS.

Many gastrointestinal symptoms can have other causes, and new, persistent or concerning symptoms should be evaluated by a healthcare professional.

But if you’ve experienced recurring bowel changes along with abdominal discomfort and were previously told that you didn’t technically meet the diagnostic criteria for IBS, it may be worth discussing the new Rome V criteria with your healthcare provider.

That’s especially true if the sticking point was that your symptoms weren’t frequent enough — or that what you experienced felt like pressure, cramping or discomfort rather than “pain.”

The definition doctors use has changed.

And for some people who have spent years knowing something was wrong with their digestive system but never quite fitting into the diagnostic box, that change could finally provide an answer.