Splitting migraines occur through a complex interplay of rapid vasoconstriction and dilation of cerebral blood vessels along with neuroinflammation. What Donguibogam describes as liver depression transforming into fire closely aligns with autonomic nervous system imbalance in modern medicine. When stress becomes extreme, the sympathetic nerve becomes excessively activated. This promotes the release of chemicals that induce vasoconstriction and inflammatory responses, such as calcitonin gene-related peptide, serving as a primary factor that worsens migraines. Chronic stress makes this cerebrovascular reactivity even more sensitive.
Hypertension is also linked to the liver's flames. Continuous stress stimulates the hypothalamic-pituitary-adrenal axis, increasing the secretion of stress hormones such as cortisol and adrenaline. These hormones cause vasoconstriction and elevate heart rate, temporarily raising blood pressure. When this reaction becomes chronic, it reduces vascular elasticity and burdens the heart, which can lead to hypertension. The phrase 'qi surges upward' mentioned in Donguibogam provides an apt description of vasoconstriction and blood pressure elevation caused by sympathetic hyperactivity.
Sudden conjunctival hyperemia occurs when the microvessels of the eyes dilate or show an inflammatory response, which can also signal autonomic nervous system dysregulation or a systemic inflammatory response. In particular, the surging of liver fire upward means that blood and heat rush toward the head, affecting the vessels around the eyes and causing hyperemia. When hypertension worsens, intraocular pressure may rise, threatening eye health.
Lastly, a quick-tempered disposition that resembles intermittent explosive disorder is closely related to the function of the amygdala and frontal lobe, the brain's emotion regulation centers. Chronic stress can disrupt the balance of neurotransmitters such as serotonin and dopamine and impair frontal lobe function, making impulsive emotional control difficult. Donguibogam states that 'when one is angry, qi surges upward,' intuitively expressing how emotional stress disrupts overall physical balance. Modern medicine shows that such difficulty with emotional regulation is not simply a personality flaw, but can stem from altered brain function and hormonal imbalance. Ultimately, the liver in Donguibogam extends beyond a simple anatomical organ to represent an integrated physiological system encompassing stress response, detoxification, and emotional regulation. Describing the diverse symptoms that emerge when this system loses balance through the insightful metaphor of a fire igniting in the liver captures this connection clearly.
