Modern medicine interprets the wisdom of Donguibogam through another lens: an autonomic nervous system imbalance. Our body's autonomic nervous system is largely divided into sympathetic and parasympathetic nerves. Like a seesaw, they balance each other to unconsciously regulate fundamental functions such as heartbeat, breathing, and digestion. However, modern life—marked by constant stress, irregular eating habits, and sleep deprivation—easily disrupts this autonomic nervous system balance.
In particular, dyspepsia of upper heat and lower cold pattern often manifests when the sympathetic nerve is excessively heightened while the function of the parasympathetic nerve is relatively reduced. The sympathetic nerve recognizes our body as being in a dangerous situation and prepares it for fight or flight. During this state, digestive function loses its priority. Gastric acid secretion increases, but the muscles of the stomach and esophagus become tense and rigid, making it easier for gastric acid to reflux into the esophagus. Because the functions of the upper esophageal sphincter and lower esophageal sphincter become unstable, stomach contents readily reflux upward. Furthermore, the stress hormones cortisol and adrenaline decrease blood flow to the gastrointestinal mucosa and induce inflammatory responses, increasing the sensitivity of the gastrointestinal tract. This is the modern medical explanation for the burning upward heat symptoms you experience.
On the other hand, what happens when the function of the parasympathetic nerve, which oversees rest and digest, declines? The digestive process slows down, and intestinal peristalsis becomes sluggish. Food remains in the stomach and intestines for prolonged periods, causing bloating and abdominal distension, while insufficient digestive enzyme and bile secretion diminishes nutrient absorption. This causes shifts in the gut microbiota, which may worsen gut dysbiosis where beneficial bacteria decrease and harmful bacteria proliferate. Gut dysbiosis produces excess gas and inflammation, creating a vicious cycle that leads back to hypomotility of the gastrointestinal tract, a cold sensation in the lower abdomen, and lower cold symptoms such as constipation or diarrhea. Throughout this process, the role of the vagus nerve is vital. As a key parasympathetic nerve, the vagus nerve directly connects the brain and digestive system to regulate overall digestive processes. When stress reduces vagus nerve activity, overall digestive function is hindered, and cold intestine symptoms may intensify.
Ultimately, dyspepsia of upper heat and lower cold pattern—manifesting as a hot stomach and cold intestines—is not merely an isolated problem of the stomach and intestines, but the result of a disrupted delicate equilibrium within the autonomic nervous system that coordinates the whole body. Chronic stress, irregular lifestyle habits, and a poor diet interact together to disrupt our body's harmonious orchestra. Such an imbalance may also be diagnosed as various modern conditions such as reflux esophagitis, irritable bowel syndrome, or functional dyspepsia. Now, you may understand more clearly why that burning distress and lower abdominal chill occur simultaneously, and how deeply interconnected everything is within the body.
