What Is a DGBI? And Why It Explains So Much

The Tummy Clinic | July 11th, 2025

You’ve had the scopes. The ultrasounds. The tests. Maybe even the elimination diets. And still—your gut symptoms persist. You’ve been told it’s not Crohn’s, not celiac, not something they can see. So what is it?

When Everything’s Normal (But Nothing Feels Right)

One of the most common phrases we hear from patients is:

“All my tests came back normal—but I still feel awful.”

There’s bloating. Pain. Irregular stools. Sometimes nausea or urgency, sometimes constipation that seems to defy logic. You may have been told “it’s just IBS,” or that stress is the cause. But what you probably weren’t told is that there’s a name for this group of conditions:

They’re called Disorders of Gut–Brain Interaction, or DGBIs.

And understanding that term can change everything.

So What Is a DGBI?

DGBIs are a group of conditions where the nervous system and digestive system stop communicating smoothly. There’s no structural damage. Nothing a scope or biopsy will catch. But that doesn’t mean the symptoms are in your head.

These are real, measurable, and diagnosable conditions that affect how your gut moves, feels, and reacts.

The most well-known DGBI is Irritable Bowel Syndrome (IBS), but others include:

  • Functional dyspepsia (chronic upper stomach discomfort)
  • Functional diarrhea or constipation
  • Abdominal migraine
  • Centrally mediated abdominal pain

What they all have in common is this: the gut is working, but it’s misfiring—because of disrupted signaling, not damage.

Why the Gut–Brain Connection Matters

The gut has its own nervous system (the enteric nervous system) which constantly communicates with the brain via the vagus nerve and other pathways. This is how we regulate digestion, sensation, motility, and immune activity.

But when that communication system becomes hypersensitive or dysregulated—often because of early life events, stress, infection, or other life factors—the gut begins to respond with:

  • Excessive pain or pressure from normal gas or stool
  • Spasms or cramping not tied to food
  • Urgency or constipation out of sync with routine
  • An amplified stress response that shows up in the gut first

And the kicker? Most standard tests are designed to look for damage or disease. Not interaction. Not signaling.

That’s why so many patients with DGBIs get told their results are “normal”—and still feel unwell.

Why This Explanation Changes Things

Once we explain what a DGBI is, many patients say:

“That actually makes sense for the first time.”

Because finally, the pieces come together:

  • Why stress and meals interact in strange ways
  • Why reassurance from tests doesn’t bring relief
  • Why no one diet seems to be the solution
  • Why every new protocol feels like a dead end

It’s not that you’ve missed the right supplement or haven’t found the right practitioner.
It’s that you’ve been given the wrong framework.

And once that changes, your plan can, too.

If You’ve Been Told “It’s Just IBS” — This Is for You

DGBIs are not a wastebasket diagnosis. They are well-studied, formally recognized conditions—mapped and named by leading gastroenterology bodies around the world.

And they’re not rare. In fact, 1 in 3 people globally live with a DGBI.

The problem is not that these conditions don’t exist.
It’s that few clinicians know how to explain them—and even fewer are trained to treat them with the full range of support patients actually need.

Where to Begin

If this sounds familiar—if your symptoms have never fit the textbook, if the testing has ruled out everything but never explained anything—there’s a good chance you’re dealing with a DGBI.

And naming it clearly is not the end of the road.
It’s the beginning of an approach that respects how your gut, brain, and whole system interact.

You don’t need to keep chasing causes that may not exist.
What you need is a map.

We can help with that.

Frequently Asked Questions

Managing IBS with diarrhea can be challenging, but making the right food choices can help. Here’s what works for many people with IBS:

  • Low FODMAP diet: This dietary approach helps reduce symptoms like diarrhea, bloating, and stomach pain. It involves removing certain foods and gradually reintroducing them to see which ones trigger your symptoms.
  • Easy-to-digest foods: Stick with foods like plain rice, cooked carrots, zucchini, and lean proteins (e.g., chicken, fish) to ease digestion.
  • Avoiding triggers: Steer clear of fatty, spicy, or fried foods, as well as dairy and caffeine. These can worsen symptoms for many people with IBS.

If you’re unsure which foods work for you, consulting with a healthcare provider can help you create a personalized meal plan.

Bloating, gas, and stomach pain are common in IBS. These symptoms often result from:

  • Gas buildup: Undigested food or fermentation in the intestines can cause gas and bloating.
  • Gut motility issues: In IBS, food may move too quickly or slowly through the digestive tract, leading to discomfort.
  • Food sensitivities: Certain foods like high FODMAP foods can cause bloating or pain.

Managing these symptoms typically involves diet modifications, stress management, and finding the foods that work best for your body.

IBS constipation can be tough, but there are ways to improve bowel movements:

  • Increase soluble fiber: Foods like oats, bananas, and carrots can help soften stool.
  • Stay hydrated: Drinking plenty of water helps keep things moving.
  • Exercise regularly: Physical activity helps stimulate digestion.

If these strategies don’t work, gentle laxatives or stool softeners might be considered, but always under the guidance of a healthcare professional.

Certain foods can make IBS symptoms worse, including:

  • High FODMAP foods: These include foods like onions, garlic, certain fruits (e.g., apples, watermelon), and dairy.
  • Fatty foods: Rich, greasy foods often cause discomfort for those with IBS.
  • Caffeine and alcohol: These can irritate the digestive system and increase symptoms like diarrhea or bloating.

By tracking your food intake and symptoms, you can start to identify which foods are causing flare-ups and work toward a personalized plan.

Constant constipation in IBS can be caused by:

  • Low fiber intake
  • Dehydration: Not drinking enough water can make stool hard and difficult to pass.
  • Stress: Emotional stress often affects digestion and can contribute to constipation.

If constipation persists despite lifestyle changes, consider speaking with a healthcare provider for further assessment and potential treatment options.

Severe bloating can occur when:

  • Gas is trapped in the intestines due to difficulty digesting certain foods or fermentation.
  • Slow motility: In IBS, the digestive system may move food too slowly, leading to bloating.

To manage bloating, consider reducing high FODMAP foods and incorporating more digestive-friendly meals. Stress management techniques like yoga or mindfulness can also help reduce bloating by calming the nervous system.