Emotions are biological events that measurably change gut function, including gastric acidity and symptom perception.¹ ²
In an fMRI study, negative emotion increased physical symptoms only in patients with IBS or fibromyalgia.³
Attention, meaning and learning help explain why DGBI symptoms persist after the original trigger fades.¹
Brain-gut behavior therapies, including gut-directed hypnotherapy, work on these emotional pathways alongside standard IBS care.⁴ ⁵
Emotions shape IBS symptoms through measurable brain-gut physiology. Swapping "it's just stress" for a clear explanation of those emotional pathways gives patients a more accurate and validating model, and makes gut-brain therapy an easier conversation.¹
"I've been told it's just stress" is one of the lines Dr. Dany Lamothe hears most in clinic. He's a medical psychiatrist and clinical assistant professor at Stanford University School of Medicine, and lead psychiatrist for Stanford Health Care's Gastrointestinal Behavioral Medicine Program. In our recent Nerva webinar, he argued that patients often hear "stress" as "nothing is really wrong."¹ What he offers instead is language that's "more precise than stress and less dismissive than it's psychological."¹ Here's the evidence behind that, and a three-step way to use it in any GI consult.
Why "it's just stress" falls short for patients with IBS and other DGBI
"Stress" falls short because it's too vague to guide care and too easy for patients to hear as dismissive, even though the biopsychosocial model behind DGBI holds up.⁶
Many patients don't feel especially stressed, and their pain, urgency or bloating feels far too real to put down to worry.¹ Dr. Lamothe's fix is to make one part of the model specific: the emotional pathways.
In his framing, fear, disgust, anger and shame aren't mental labels. They're coordinated changes across the brain, the autonomic nervous system and the gut.¹
Watch: How emotions shape gut symptoms
In this Nerva clinician webinar, Dr. Lamothe walks through the evidence linking emotions to gut function and explains why DGBI symptoms persist. He also shares a simple way to bring emotions into any GI consult.
Why asking about emotions is part of the medical model in IBS care
Asking about emotions is part of the medical model in IBS care. Emotions are physiological events that act on the same brain-gut pathways Rome V uses to define DGBI.¹ ⁶
To plenty of clinicians (and patients), bringing emotions into a GI consult can feel a bit soft, closer to wellness talk than medicine.
Dr. Lamothe's point is that the evidence says otherwise.
The idea isn't new, either. In the 1820s, army surgeon William Beaumont watched digestion in real time through a gunshot wound in his patient Alexis St. Martin's stomach. He recorded that anger and fear visibly changed gastric secretion.⁷
Modern research has since filled in the mechanism. Sustained negative emotion activates the hypothalamic-pituitary-adrenal (HPA) axis, with downstream effects on immune, cardiovascular and GI function.¹
That's why Dr. Lamothe calls the physical-versus-emotional split "too simplistic" and "misleading."¹
"Emotions are part of brain-body physiology. So asking about emotion is not leaving the medical model. It is part of the understanding of medical problems." – Dr. Dany Lamothe, Medical Psychiatrist, Stanford University School of Medicine¹
Seen this way, an emotional history sits alongside a diet history or a medication review. It's clinical information, not a detour.
How emotions change gut function: evidence from lab studies
Lab studies show emotions change gut function directly, shifting gastric physiology and symptom perception within minutes of an emotional trigger.
In 701 participants from several countries, emotions like fear, anger and disgust showed up consistently in the chest and abdomen on self-reported body maps.⁸
Using an ingestible SmartPill in 31 healthy men, Porciello and colleagues found that video clips inducing disgust and fear made the stomach more acidic. The more acidic it got, the stronger the reported emotion.²
The most clinically relevant study is Bogaerts et al. Among 60 women viewing negative images in an fMRI scanner, everyone felt worse, but only patients with IBS or fibromyalgia reported more physical symptoms.³
Those patients also showed heightened activation in the somatosensory cortex, the brain region that processes bodily sensation.³
"Gut symptoms are not just relayed from the periphery or from the organ. They're shaped and filtered by the brain." – Dr. Dany Lamothe, Medical Psychiatrist, Stanford University School of Medicine¹
Why DGBI symptoms persist: attention, meaning and learning
DGBI symptoms persist when attention, meaning and learning lock sensation and protective behavior together.¹
Dr. Lamothe describes the brain as a prediction machine. It doesn't just register a gut signal, it asks what that signal means and whether it's dangerous.
A mild sensation after a meal lands very differently in someone with a history of pancreatitis or frightening vomiting episodes.
After enough painful meals, the nervous system can learn that "meals are dangerous." Restriction and body monitoring then become sensible protective responses.
Over time, though, those responses keep reinforcing a threat message that may no longer be accurate.¹
How to talk to IBS patients about emotions: notice, ask, connect
Any GI clinician can make room for emotion in a routine consult with Dr. Lamothe's three steps: notice, ask, connect.¹
Applying this in practice
Start with the neurobiology before you raise any referral.
Dr. Lamothe spends the first minutes of his assessments taking apart mind-body dualism. He finds it makes patients far more open to brain-gut care.¹
Knowing a patient is afraid of eating or angry about past invalidation can change your plan as much as a test result would.
Where gut-directed hypnotherapy fits for emotion-driven gut symptoms
Gut-directed hypnotherapy is a brain-gut behavior therapy that works on the expectation layer of symptoms. Both the ACG guideline and the Rome Foundation support these therapies in IBS.⁴ ⁵
Dr. Lamothe explains that hypnosis goes beyond relaxation. It "taps in this unconscious processing of the brain" and "can change what the brain expect[s], which can then lead to different outcome[s] in the body."¹
Nerva is a 6-week digital gut-brain therapy program built on gut-directed hypnotherapy, taking 15–20 minutes a day.
In a randomized controlled trial, 81% of participants achieved a clinically significant improvement on the IBS Symptom Severity Scale.⁹ You can offer Nerva as a first-line option, alongside diet and medication, or later in the care pathway.
How to refer patients with emotion-linked gut symptoms to gut-brain therapy
Referral works best once you've had the "connect" conversation, when the patient understands their emotions and gut symptoms share the same physiology.
At that point, gut-brain therapy stops sounding like being told to "just relax" and starts to feel like the logical next step.
Framing it as retraining how the brain and gut communicate, rather than "dealing with stress", keeps it inside the medical model Dr. Lamothe describes.
You can refer patients to Nerva through theclinician referral form. Referred patients get access to financial assistance, and you'll receive symptom reports so you can track their progress from start to finish.
Frequently asked questions
Is IBS caused by emotions?
IBS isn't caused by emotions alone. It's a disorder of gut-brain interaction in which gut physiology, emotion, attention and learning interact.⁶ Emotions are one modifiable contributor, which makes them a practical target for care.
Can anxiety or panic attacks cause diarrhea?
Panic attacks can cause diarrhea, and abdominal distress is one of the diagnostic symptoms of a panic attack.¹⁰ Dr. Lamothe notes that unrecognized panic presenting as diarrhea can make GI symptoms more chronic, so screening matters.¹
Does talk therapy help IBS symptoms?
General talk therapy and brain-gut behavior therapy aren't the same, so symptoms can persist in patients who are already in therapy.¹ Asking what the current therapy focuses on, and coordinating with the treating psychologist, helps realign care.⁴
Who should not do gut-directed hypnotherapy?
Gut-directed hypnotherapy is generally deferred in severe, untreated depression or psychotic disorders until they're in remission.¹ Dr. Lamothe advises checking with a psychiatrist or psychologist first for patients with severe PTSD and a tendency to dissociate.¹
What can IBS patients do at home to regulate emotions?
Patients can start with a daily regulating practice, such as diaphragmatic breathing or grounding, for five minutes once or twice a day.¹ A 30-second "emotion scientist" check-in during a flare (body, emotion, thought, urge, next step) builds space between the symptom and the reaction.¹
Porciello G, Monti A, Panasiti MS, Aglioti SM. Ingestible pills reveal gastric correlates of emotions. eLife. 2024;13:RP85567. doi:10.7554/eLife.85567
Bogaerts K, Van Den Houte M, Jongen D, et al. Brain mediators of negative affect-induced physical symptom reporting in patients with functional somatic syndromes. Transl Psychiatry. 2023;13:285. doi:10.1038/s41398-023-02567-3
Keefer L, Ballou SK, Drossman DA, et al. A Rome Working Team report on brain-gut behavior therapies for disorders of gut-brain interaction. Gastroenterology. 2022;162(1):300-315.
Lacy BE, Pimentel M, Brenner DM, et al. ACG clinical guideline: management of irritable bowel syndrome. Am J Gastroenterol. 2021;116(1):17-44. doi:10.14309/ajg.0000000000001036
Drossman DA, Hasler WL. Rome IV – functional GI disorders: disorders of gut-brain interaction. Gastroenterology. 2016;150(6):1257-1261.
Beaumont W. Experiments and Observations on the Gastric Juice, and the Physiology of Digestion. F.P. Allen; 1833.
Nummenmaa L, Glerean E, Hari R, Hietanen JK. Bodily maps of emotions. Proc Natl Acad Sci U S A. 2014;111(2):646-651. doi:10.1073/pnas.1321664111
Anderson EJ, Peters SL, Gibson PR, Halmos EP. Comparison of digitally delivered gut-directed hypnotherapy program with an active control for irritable bowel syndrome. Am J Gastroenterol. 2025;120(2):440-448. doi:10.14309/ajg.0000000000002921
American Psychiatric Association. Diagnostic and Statistical Manual of Mental Disorders. 5th ed, text rev. American Psychiatric Association; 2022.
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