Modern medicine interprets the Donguibogam concepts of the lung and kidney through anatomical and physiological perspectives. Voice production occurs when breath from the lungs vibrates the vocal cords, with the structure of the larynx and the movement of the vocal cords playing pivotal roles. Being dyspneic with voice cracking often indicates more than an isolated vocal cord issue, pointing instead to complex dysfunctions across the respiratory system, endocrine system, and nervous system.
First, hoarseness accompanied by voice cracking can stem from vocal cord inflammation such as acute or chronic laryngitis, structural problems such as vocal cord nodule or polyp, chronic vocal cord irritation from gastroesophageal reflux disease, or thyroid disease. Neurological issues such as vocal cord paralysis or muscle tension dysphonia cause voice changes through excessive tension in the muscles surrounding the vocal cords. What Donguibogam describes as weakening of lung qi aligns in modern terms with insufficient respiratory volume or a qi and blood circulation disorder of the vocal cords, reflecting hypofunction in the tissues around the vocal cords.
When dyspneic symptoms accompany voice changes, closer attention is warranted. Beyond respiratory conditions such as asthma or chronic obstructive pulmonary disease, potential factors include cardiovascular disease such as heart failure, anemia, anxiety disorder, panic attack, or vocal cord dysfunction where respiration becomes irregular due to vocal cord dysfunction. Excessive stress stimulates the sympathetic nerve, raising the heart rate, quickening respiration, and tensing the muscles around the larynx, which impairs vocal cord function. This parallels the Donguibogam view that deficiency of kidney qi leads to systemic energy depletion and autonomic nervous system imbalance.
Irregular routines and stress place a strain on the endocrine system, as observed in adrenal fatigue syndrome, which can trigger a systemic inflammatory response or lower immunity, adversely affecting the organs responsible for voice and respiration. Additionally, the vagus nerve regulates autonomic functions such as vocal cord movement, digestion, heart rate, and respiration. Stress-induced vagus nerve dysfunction can disturb both vocal function and breathing at the same time. In this way, lung-kidney deficiency in Donguibogam corresponds to functional decline across the complex systems governing voice production and respiration, showing how deeply vocal changes are tied to whole-body health.
