Modern medicine views persistent abdominal fullness and trapped gas as functional abdominal bloating or a manifestation of irritable bowel syndrome. While previously attributed solely to stress or dietary habits, an imbalance in the gut microbial ecosystem, known as gut dysbiosis, has recently been identified as a key factor.
When consumed food—particularly incompletely digested carbohydrates or specific fibers such as FODMAPs—reaches the small intestine and large intestine, it undergoes excessive fermentation by gut microbiota, producing substantial amounts of hydrogen, methane, and carbon dioxide. These gases irritate the intestinal wall and expand the bowel, causing abdominal distension, discomfort, and frequent flatulence. When harmful bacteria outnumber beneficial gut bacteria, this fermentation intensifies, triggering inflammation in the intestinal wall and increasing intestinal permeability, a condition known as leaky gut syndrome.
The gut-brain axis also plays an essential role. Psychological factors like stress and anxiety affect the autonomic nervous system, altering intestinal motility and suppressing gastric acid secretion and digestive enzyme activity. When the sympathetic nerve becomes overactive, intestinal motility slows, leaving food in the intestines longer and allowing more fermentation to occur. Conversely, when the parasympathetic nerve is underactive, overall digestion does not proceed smoothly.
Frequent antibiotic use, diets centered on processed foods, irregular routines, and inadequate sleep also contribute to worsening abdominal distension. Rather than focusing only on expelling gas, an integrative approach is needed to foster a healthy intestinal environment, manage stress, and support overall gastrointestinal function.
