Does Stress Bloat Your Stomach? Nervous Abdominal Distension: Calming the Mind to Comfort the Gut

The qi stagnation mentioned in Donguibogam can be explained in modern medicine through the concept of the gut-brain axis. The brain and the gut interact and are closely connected, with the core of this link being the autonomic nervous system, various neurotransmitters, and the gut microbiota. Under stress, the brain activates the hypothalamic-pituitary-adrenal axis to secrete the stress hormone cortisol. This cortisol directly affects gastrointestinal motility. It can reduce digestive fluid secretion and abnormally accelerate or inhibit intestinal peristalsis. These changes manifest as digestive symptoms such as abdominal distension, abdominal pain, diarrhea, or constipation. In addition, the gut produces large amounts of neurotransmitters such as serotonin and gamma-aminobutyric acid, earning it the name the second brain. These substances play a crucial role in regulating our mood and emotions, but stress disrupts the balance of these neurotransmitters. For instance, stress alters serotonin secretion in the gut to induce an intestinal motility disorder, or heightens the sensitivity of receptors that regulate pain sensation, thereby aggravating visceral hypersensitivity. Because of this, one experiences extreme abdominal discomfort even from minor stimuli that others would not feel. Chronic stress can also trigger leaky gut syndrome, which increases the permeability of the intestinal barrier. When the intestinal barrier loosens, harmful substances in the gut can enter the bloodstream and cause a systemic inflammatory response, leading to a vicious cycle that further deteriorates gut health. Furthermore, stress disrupts the balance of the gut microbial ecosystem, the microbiome, potentially causing harmful bacteria proliferation and inflammation. Because the gut microbiota plays an essential role in immunity and digestion, its imbalance further deepens digestive symptoms. In conclusion, the brain and gut act like a single team, profoundly influencing each other. Stress disrupts this teamwork, manifesting as physical symptoms of abdominal discomfort. Rather than dismissing it merely as a gut problem, an integrative approach that cares for both the mind and brain health is necessary.