The True Nature of Functional Gastrointestinal Disorders - Incheon Functional Gastrointestinal Disorder

“I’m told there’s nothing wrong, so why do I feel this way?”

Hello. This is Baeknokdam Korean Medicine Clinic.

Have you ever heard something like this?

• “My upper endoscopy is normal, but I constantly feel bloated and uncomfortable.”
• “My abdomen is always bloated, and I sigh as soon as I finish eating.”
• “I go to the bathroom frequently, but my large intestine appears clear on tests.”

Clearly, your body feels uncomfortable and distressed, but the hospital tells you “there’s nothing wrong.”

But is being told “nothing is wrong” the complete answer?

Today, we’ll talk about the common name for such cases: functional gastrointestinal disorder.

Defining the Concept – The Illness Exists, But Is Invisible

Functional gastrointestinal disorder refers to cases where gastrointestinal symptoms repeatedly occur despite all tests, such as endoscopy, CT, MRI, and blood tests, showing no abnormalities.

The term “functional” means that while there is no structural damage, issues have arisen in gastrointestinal motility, sensory regulation, autonomic nervous system function, and other related areas.

In other words, the body is clearly impaired, but the nature of this impairment is not visible.

Various Diagnoses – Different Names, Same Roots

Functional gastrointestinal disorders encompass several diagnostic names. Representative examples include:

• Functional Dyspepsia (FD): early satiety, postprandial discomfort, epigastric pain
• Irritable Bowel Syndrome (IBS): abdominal pain + recurring diarrhea or constipation
• Functional diarrhea, constipation, vomiting, belching disorder: long-term recurring abnormal bowel movements or gastrointestinal responses

These diagnoses are made according to the internationally recognized Rome IV criteria, and a diagnosis is given when the frequency and duration of symptoms meet these criteria.

Pathophysiology – Not Just a Gastrointestinal Problem

Functional gastrointestinal disorder is not merely a matter of a sensitive digestive system; it signifies that a deeper system is being disrupted.

• Gastrointestinal Motility Disorder: Delayed gastric emptying or irregular peristalsis causes postprandial discomfort and satiety.
• Visceral Hypersensitivity: The senses in the stomach or intestines become overly sensitive, making even normal stimuli feel painful.
• Dysfunction of the Gut-Brain Axis: Stress or depression affects the gastrointestinal tract via the brain, leading to a real decline in gastrointestinal function.
• Gut Microbiome Imbalance (Dysbiosis): An increase in harmful gut bacteria or a proliferation of gas- and inflammation-inducing substances causes bloating and pain.
• Mucosal Barrier Dysfunction + Low-Grade Inflammation: The intestinal barrier weakens, becoming more sensitive to stimuli, and mild inflammatory reactions persist.

When Did It Gain Attention? – The Real Problem Was Being Told 'Nothing Is Wrong'

Functional gastrointestinal disorder began to receive serious attention starting in the 1980s. As a flood of patients presented with severe symptoms but normal test results, the limitations of structural diagnosis became apparent.

Subsequently, diagnostic criteria evolved from Rome I → II → III → IV, and with the introduction of new pathophysiological models involving the gut-brain axis, gut microbiome, and autonomic nervous system regulation, this condition could no longer be dismissed as simply ‘psychosomatic.’

Especially recently, functional gastrointestinal disorders have been observed as sequelae following infection, or have appeared in conjunction with autonomic dysfunction, accompanied by chronic fatigue, insomnia, panic disorder, and other conditions.

Treatment – System Restoration, Not Symptom Suppression

The treatment for functional gastrointestinal disorder is not about temporarily suppressing symptoms, but about recalibrating the disrupted rhythms and systems.

• Medication: prokinetics, acid suppressants, antispasmodics, antidepressants (low-dose)
• Diet: FODMAP restriction, avoidance of irritating foods, eating pace adjustment
• Emotional/Nervous System Management: stress management, relaxation training, cognitive behavioral therapy
• Gut Environment Improvement: probiotics, SIBO treatment, dietary fiber adjustment
• Korean Medicine Treatment: customized pattern identification (byungjeung) treatment for patterns such as Qi deficiency, liver Qi stagnation, food stagnation, etc.

If You're Suffering Yet Seemingly Fine, You're Not Truly Fine

Functional gastrointestinal disorder is not merely ‘sensitivity,’ but a state where our body’s rhythms and circuits are invisibly impaired.

Outwardly, one may seem fine, but internally, senses become hypersensitive, the gastrointestinal tract acts erratically, and suffering ensues with the brain-gut connection disrupted.

In such cases, rather than merely suppressing symptoms with a single medication, a process of adjusting and restoring the entire system is needed. That is the core of functional gastrointestinal disorder treatment.

Thank you.

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