The Mind-Body Connection: Why Abdominal Pain Isn't Always "Just Physical"
Understanding functional symptoms, the science of predictive coding, and how culture shapes the way we experience pain
By Dr. Samir Abuhamad — Double Board Certified in Psychiatry and Internal Medicine
It is common in medicine to view the mind and the body as separate entities, under the care of separately-trained physicians. However, our paradigm is being challenged by research that increasingly shows that the mind and the body are, in fact, connected. In this series of blog posts, I hope to explore this mind-body connection and to discuss the many ways in which our physical health and lifestyle choices impact our mental health, and vice versa.
When Physical Symptoms Don't Have a Physical Cause
As the field of medicine expands, physicians are starting to recognize that not all physical symptoms have their roots in medical causes. One example is abdominal pain. Commonly evaluated and managed by a primary care physician or a gastrointestinal specialist with lab tests and procedures, we are increasingly recognizing the interplay between a patient's mental health and their perceived severity of symptoms.
Although some patients with abdominal pain have a medical cause often identified on workup, some do not and will receive a diagnosis of "functional abdominal pain" or "somatic symptom disorder." The notion that one's perceived pain is "in their head" can be frustrating and dismissive for many. However, understanding and recognizing that the mechanism behind functional symptoms is real, measurable, and worthy of the same clinical respect as any "medical" diagnosis can change the way patients relate to their own bodies.
What "Functional" Really Means
First, it's worth dismantling a common misconception: a "functional" diagnosis does not mean nothing is wrong, nor does it mean the workup was incomplete. It means that after reasonable medical causes have been excluded, the symptoms are best explained by how the nervous system is processing and generating signals, not by structural damage or disease. This is a mechanism, not an absence of one.
The Brain's Prediction Problem: A Look at Predictive Coding
One useful way to understand this mechanism is through the lens of predictive coding. Our brains are not passive receivers of sensory information; they are constantly generating predictions about what the body should be feeling, and then updating those predictions based on incoming signals. Under normal circumstances, this is remarkably efficient. It's why you don't consciously notice the sensation of your shirt against your skin a few minutes after putting it on.
But this same predictive system can misfire. The gut, in particular, is a noisy place full of low-level signals from digestion, motility, and stretch that are usually filtered out as irrelevant "background noise." When the brain's threshold for what counts as noteworthy shifts — often due to heightened anxiety, hypervigilance, or prior painful experiences — that background noise can be reinterpreted as something significant. The brain, primed to expect pain, may amplify an ordinary signal into a distressing one.
In this sense, the pain isn't imagined; it's a real perceptual event produced by a nervous system that has recalibrated what counts as "signal" versus "noise."
Where Unprocessed Emotions Go
This recalibration doesn't happen in a vacuum. Emotional experiences that go unprocessed — internalized trauma, chronic anxiety, unspoken grief or depression — have to go somewhere. I sometimes describe the brain as a box with finite capacity. When that box fills with unresolved emotional material and has no outlet, the pressure often finds a different route out, manifesting as physical symptoms in the gut, the head, the muscles, or elsewhere. The body, in a sense, is speaking a language the mind hasn't found words for yet.
Culture Shapes How We Experience Pain
It's also important to recognize that how this process is experienced is shaped by culture. In many Middle Eastern cultures, for instance, psychological distress is often somaticized from the outset. Anxiety is felt and described as a tightness in the chest, a churning stomach, or a headache, rather than as a primarily cognitive or emotional state.
In much of Western culture, by contrast, there's a stronger tendency to locate distress "in the mind" first, with physical symptoms viewed as secondary or even suspect. Neither framework is more or less legitimate — they simply reflect different cultural vocabularies for the same underlying mind-body process. Recognizing this helps clinicians avoid pathologizing a patient's way of describing their own experience, and helps patients feel less alone in how they express what they're going through.
What's Coming Next in This Series
In the posts ahead, we'll continue exploring this bidirectional relationship from several angles:
Medical conditions masquerading as psychiatric illness — and why a thorough medical workup remains essential even when symptoms appear purely psychological
Lifestyle pillars of mental health management — using ADHD as our basis, we'll walk through sleep, nutrition, exercise, and concentration strategies, alongside the role medications play
The endocrine system and mental health — a close look at GLP-1 agonists, a class of medications generating significant interest for their metabolic benefits, examining the emerging evidence on their psychiatric effects (both promising and concerning), along with the broader endocrine factors that intersect with mental health
Taken together, this series aims to reinforce a simple but often overlooked truth: the mind and body were never really separate to begin with.
