Stomach Pain and Constant Restroom Trips? Symptoms When 'Fire' Stirs Up the Gut

Modern medicine explains the link between the mind and gut described in Donguibogam through the concept of the gut-brain axis. The brain and the gut communicate constantly through a complex, interconnected neural network, much like two individuals holding a quiet conversation. Under stress, the brain secretes stress hormones such as cortisol and adrenaline, which travel through the bloodstream into the gut and directly disrupt digestive functions. The very first change appears in the motility of the gut. Under severe stress, the gut moves excessively to cause diarrhea, or conversely ceases moving to cause constipation. Additionally, intestinal mucosal permeability may increase, potentially leading to a condition known as leaky gut syndrome, where harmful substances in the gut penetrate into the bloodstream and can trigger a systemic inflammatory response. The gut microbiota environment, or microbiome, also responds very sensitively to stress, resulting in dysbiosis, where beneficial bacteria decrease and harmful bacteria increase. Moreover, the vast majority of our body's serotonin resides in the gut, and this serotonin plays a critical role not only in feelings of well-being but also in regulating intestinal motility and sensation. Stress affects this intestinal serotonin secretion and receptor response, rendering gut sensation abnormally sensitive. Consequently, visceral hypersensitivity develops, causing one to perceive greater pain from minor stimuli, and normal intestinal movements that would usually go unnoticed can lead to severe abdominal pain. All these processes ultimately become a major cause of functional digestive disorders such as irritable bowel syndrome. Science is clearly revealing how profoundly modern stress affects gut health.