The phrase 'the lung's qi weakens' mentioned in Donguibogam carries multifaceted meaning in modern medicine. The human lung is not merely an air sac, but a complex organ equipped with an elaborate defense system that continuously communicates with the external environment to protect the body.
Chronic cough, phlegm, and bronchitis can be seen as prominent warning lights that emerge when problems occur in this defense system of the lung. The delicate mucosa lining the bronchus serves as the body's first line of defense. On this mucosa, countless cilia move continuously like brooms, running the mucociliary escalator to expel external foreign matter, such as fine dust, bacteria, and viruses, along with phlegm.
However, what happens when the bronchial mucosa is repeatedly damaged by air pollutants, allergens, or recurring infections? Ciliary function declines, and goblet cells, which secrete mucus, excessively proliferate, causing mucus and phlegm to increase in quantity and turn thick and sticky. This sticky phlegm cannot be cleared easily and accumulates in the bronchus, creating an environment favorable for bacteria and viruses to multiply. This leads to a vicious cycle of recurring infection and inflammation, eventually developing into chronic bronchitis.
The Donguibogam expression 'the lung's qi surges upward in reverse' can be linked in modern medicine to hypersensitivity reactions of the vagus nerve. As a major component of the parasympathetic nervous system, the vagus nerve is distributed throughout the bronchus, regulating bronchoconstriction and mucus secretion. A state of chronic inflammation oversensitizes these vagus nerve endings, causing the bronchus to react excessively to cold air or minor stimuli, which can lead to severe coughing seizures. This also indicates a state where the body's autonomic nervous system loses balance and leans toward inflammatory and constrictive responses.
Furthermore, recent studies are deepening our understanding of the close connection between gut health and lung health, known as the gut-lung axis. Dysbiosis can cause systemic inflammation and affect the immune response of the lung, making it more vulnerable to respiratory infections and chronic inflammatory diseases. In this way, modern medicine approaches chronic cough and phlegm not just as localized bronchial issues, but from a comprehensive perspective encompassing systemic immune system imbalances, nervous system regulation problems, and even gut health. Just as Donguibogam understood lung health within the overall balance of the body, modern medicine also strives to identify and address root causes rather than merely suppressing symptoms.
