I have met this patient hundreds of times, and never the same person twice. She comes to the emergency department late on a weeknight with pain she has carried, in one form or another, for years. She brings a folder, or a phone full of screenshots, because she has learned that nobody remembers her story from one visit to the next. Behind her is a stack of normal results: bloodwork, a CT scan, an endoscopy, sometimes two. Every test says the same thing. Nothing is wrong. A few hours later she leaves with a discharge paper that says it again in smaller print, and she does not feel reassured. She feels dismissed, and she is right to.

I have spent most of my adult life in rooms like that one. I went to medical school at the Philadelphia College of Osteopathic Medicine, trained in emergency medicine at Cooper University Hospital in Camden, where I was chief resident, and ran a state division of public health through the worst of a pandemic. I edit a national emergency medicine publication, which means I read more studies in a month than most physicians read in a year. I still pick up shifts in community hospitals across Pennsylvania, Delaware, and New Jersey. I offer all of this not to establish authority but to be honest about the vantage point and its blind spots. The emergency department taught me a great deal about how bodies fail fast. For a long time it taught me almost nothing about how they fail slowly.

What the emergency department is for

An emergency department is built to do one thing exceptionally well. It rules out death tonight. When you arrive with chest pain, my entire apparatus, the monitors, the labs, the imaging, the reflexes drilled into me over a decade, organizes around a single question: is this the thing that kills you before morning? We are very good at answering it. We are a machine for catastrophe, and catastrophe is a fast, specific, measurable event.

A decade of intermittent abdominal pain is not that event. It is a different question, asked on a different timescale, and the tools that answer the first question are mostly silent on the second. A normal scan tonight tells you that you are not bleeding into your abdomen tonight. It does not tell you why you have felt unwell for three years. When we hand a patient a clean set of results and call it reassurance, we are answering a question she never asked, and declining the one she did.

I want to be careful here, because it would be easy to turn this into a complaint about my own specialty, and it is not one. Emergency medicine is the right tool for the emergency. The trouble is that a person with a chronic condition keeps landing in the one part of the health system designed to think in hours, and keeps being measured against the only question that part of the system knows how to ask. She is failed less by a bad test than by the right test aimed at the wrong question.

A habit of mind from the submarine fleet

Before medicine I studied aerospace engineering at the Naval Academy and served in the Navy's nuclear submarine community, where thinking about complex systems is the whole job. The lesson that stayed with me is this. Complicated systems rarely fail loudly at first. They fail quietly, at the interfaces, at the seams where one subsystem hands off to another. A reading drifts. Two components that each test fine on their own disagree at the boundary between them. By the time the failure is loud enough to trip an alarm, it has usually been building for a long while at a junction nobody thought to watch.

The gut and the brain are joined by exactly that kind of interface. An entire nervous system is embedded in the wall of the digestive tract, hundreds of millions of neurons in constant two-way conversation with the brain through the vagus nerve. When a workup examines the stomach alone, or the brain alone, both can look entirely normal while the trouble lives in the signaling between them. Our diagnostic tools are built to inspect organs. They are poorly built to inspect the conversations organs have with one another.

What the evidence actually says

For years I assumed we had so little to offer these patients because the science simply did not exist. When I finally sat down and read it, I found the opposite. Disorders of gut-brain interaction are among the most common conditions in all of medicine. The largest global study to date, covering thirty-three countries, found that roughly forty percent of adults meet criteria for at least one of them. These are not vague complaints filed under stress. They are defined conditions with describable mechanisms: altered motility, heightened sensitivity of the gut's own nerves, low-grade immune activation, and disrupted signaling along that gut-brain interface. And they respond to treatment, sometimes strikingly well, when a clinician takes the trouble to treat them.

I have watched what happens to these patients, over and over. She sees a gastroenterologist, who finds nothing structural and refers her onward. She sees a second physician who orders the same tests a second time. Somewhere along the way the word "anxiety" lands in a note, and from then on every new clinician reads it first and reasons backward from it. None of this is malicious. It is simply what a system does once it has decided, in advance, that an absence of findings is the same as an absence of disease.

The field's own language has been moving in this direction for a while. The older habit was to call these problems "functional," a word that in practice too often meant we could not find the cause, so perhaps there was none. The current term, disorders of gut-brain interaction, names a mechanism instead of shrugging at one. That shift matters, because the dismissal I had taken part in for years did not come from ignorance. The information had been sitting in the literature the whole time. What we lacked was a clinical culture willing to treat a normal scan as the start of an inquiry rather than the end of one. That is a system failure, not a failure of knowledge. Telling a person with a real, mechanistic, treatable condition that nothing is wrong reflects not a gap in what medicine understands but a gap in what medicine chooses to do with it.

Why I started paying attention to patterns

The other thing the emergency department is bad at is time. I see a patient once, at her worst, for a few hours, and then she is gone and I never learn what happened next. A single snapshot taken during a crisis tells you almost nothing about a condition that unfolds over months. Chronic gut-brain symptoms live in the pattern: what preceded a flare, what the surrounding week looked like, how sleep and stress and food and the calendar line up against the days that go wrong.

That is where I started paying attention. Symptoms carry real signal when you track them honestly over time. One bad day is noise. A hundred days recorded plainly, without flinching from the inconvenient entries, begin to form a picture that no single visit could produce. Medicine mostly collects the snapshot and throws the timeline away, and it turns out the timeline was the useful part all along.

This is not a mystical claim about learning to listen to your body. It is a claim about data. A chaotic emergency visit is a single, badly timed measurement of a system that changes from one week to the next. To understand a system like that, you do not stare harder at one frame. You watch it move, and you write down what you see.

Why I started BellyMD

I started BellyMD with my wife, Kady, for a reason I can state without embellishment. These conditions deserve to be taken seriously, treated as real physiology worth measuring and worth managing, rather than a diagnosis of exclusion handed over on the way out the door. That is the whole of the ambition. Everything else follows from it.

A normal test is not the same thing as a well person.

Rick Pescatore, DO, is a board-certified emergency physician and the founder of BellyMD. This article is educational and is not medical advice. These statements have not been evaluated by the Food and Drug Administration. This product is not intended to diagnose, treat, cure, or prevent any disease.