An Irritable Bowel That Rushes to the Bathroom Right After Eating

In modern medicine, explaining the spleen and stomach concept from the Donguibogam involves the gut-brain axis. Like a massive highway, the brain and gut constantly exchange signals. When we experience stress or feel anxiety, the brain directly affects the gut, and poor gut health also influences brain function. The symptom of rushing to the bathroom right after eating is very likely diarrhea-predominant irritable bowel syndrome, which is one of the representative conditions that appear when the balance of this gut-brain axis is disrupted. About 90% of serotonin, known as the happiness hormone, resides in our gut. It is an important neurotransmitter that regulates gut motility and sensation. When the balance of gut microbiota is disrupted by stress or poor dietary habits, problems arise in this serotonin regulation, causing the gut to become excessively sensitive or move too quickly. When food enters, it should be digested and absorbed at a normal pace, but because it moves too fast, water and nutrients cannot be properly absorbed and are discharged as diarrhea. It is like an accident occurring on a highway when there are too many speeding cars. Inflammation can also play a role. When micro-inflammation occurs in the intestinal mucosa, intestinal permeability increases, allowing toxins or microorganisms to easily enter the bloodstream. As this activates an immune response, gut sensitivity may be further amplified. In addition, a hypersensitivity reaction to specific food components such as fermentable carbohydrates like FODMAPs or indigestion caused by insufficient gastric acid secretion can trigger diarrhea symptoms. The complex interaction in which stress signals sent by the brain stimulate immune cells in the gut, alter the gut microbiota environment, and lead to abnormal gut motility ultimately manifests as irritable bowel syndrome. The signals our body sends are far too intricate and important to be dismissed as just a simple stomach upset.