Modern medicine explains the concept of rebellious stomach qi through autonomic nervous system imbalance and digestive system interactions. The stomach is far more than an organ that processes food; it contains an intricate neural network often described as the second brain, maintaining constant communication with the central nervous system. In particular, the vagus nerve functions as a direct pathway between the brain and the stomach, reacting sensitively to emotional strain such as stress and anxiety.
The concept of qi surging upward corresponds in modern medicine to acid reflux, impaired gastric peristalsis, nausea, and vomiting. Under severe stress, sympathetic nerve activity surges while parasympathetic nerve activity drops. This leads to abnormal gastric acid secretion or reduced gastrointestinal motility, slowing digestion and causing uncomfortable fullness. At times, gastric contents reflux into the esophagus, leading to pronounced heartburn and epigastric pain, as if the brain has sent an unwarranted emergency alarm to the digestive tract.
The gastric mucosa is directly influenced by the stress hormone cortisol. Chronic stress reduces blood flow volume to the gastric mucosa and suppresses mucin secretion, which shields the stomach wall from gastric acid. When irritating foods or irregular eating habits are introduced to a compromised mucosal lining, acute inflammation develops easily. This represents the typical mechanism of acute gastritis. While Helicobacter pylori infection, specific medications, and alcohol consumption remain major causes, acute gastritis today is frequently driven by combined psychological factors and lifestyle habits.
Nausea and vomiting occur when the vomiting center in the brain is stimulated, whether by distress signals traveling along the vagus nerve or by shifts in neurotransmitters like serotonin that influence gastrointestinal motility and sensitivity. The Donguibogam's concept of interference between clear and turbid qi reflects this breakdown in the internal stomach environment, where imbalances among gastric acid, digestive enzymes, and the microbiota produce inflammation and motility disturbances. Far from being a minor case of heartburn, it serves as a meaningful signal of disrupted systemic balance.
