Dreading the Bathroom During Exam Week? Why Stress Shuts Down Your Gut

Modern medicine provides a scientific explanation for the profound insights of the Donguibogam. This is known as the gut-brain axis, which reveals that our brain and gut constantly communicate and are closely connected. Like a massive highway, the brain and gut share their real-time states through nerves, hormones, and the immune system. When exposed to stress, the brain reacts immediately. It secretes the stress hormones cortisol and adrenaline, and activates the sympathetic nervous system. The sympathetic nervous system places our body into a fight-or-flight state to prepare for emergency situations. During this response, heart rate and blood pressure increase, and more blood is directed toward the muscles. The problem is that during this process, blood flow to the digestive system decreases, and intestinal peristalsis is suppressed. In an emergency state, bowel function essentially pauses. Furthermore, stress exerts a significant impact on the gut microbiome. As beneficial bacteria decrease and harmful bacteria proliferate, dysbiosis easily occurs. This can increase intestinal permeability, potentially triggering leaky gut syndrome. When the intestinal wall weakens, inflammatory substances and toxins can enter the bloodstream and trigger a systemic inflammatory response, creating a vicious cycle that further worsens intestinal function. Moreover, the gut produces so many neurotransmitters that it is often called the second brain. Did you know that over 90% of serotonin, known as the happiness hormone, is produced in the gut? Stress disrupts the production and secretion of serotonin in the gut, which directly affects not only mood swings but also intestinal peristalsis. As bowel movements become sluggish or excessively rapid, symptoms such as constipation or diarrhea emerge. Through these mechanisms, chronic stress disrupts the balance of the autonomic nervous system, increases intestinal sensitivity, and provokes inflammatory responses, ultimately leading to functional gastrointestinal disorders such as irritable bowel syndrome. Therefore, managing stress is not merely a mental concern, but an essential component of safeguarding gut health.