The balance between the heart and kidneys and their disharmony described in Donguibogam can be viewed from a modern medical perspective as closely tied to autonomic nervous system imbalance. When stress intensifies, our sympathetic nerve becomes excessively active, while the parasympathetic nerve fails to function properly, easily disrupting the body's balance. It is much like a car whose accelerator and brakes have malfunctioned simultaneously.
The upward surge of heart heat connects directly to sympathetic hyperactivity, which accelerates heart rate and triggers palpitations. The heart reacts with great sensitivity to stress, producing anxiety and restlessness, which markedly impairs sleep quality. An imbalance in neurotransmitters produced in the brain, such as serotonin and melatonin, serves as a primary driver that further worsens this anxiety insomnia. Chronic elevation of cortisol, the stress hormone, makes falling asleep difficult and disrupts cycles between REM sleep and non-rapid eye movement sleep, preventing deep rest.
Meanwhile, the drying up of kidney water can be linked to a chronic inflammatory state, dehydration, electrolyte imbalance, or adrenal hypofunction. Moving far beyond simply filtering waste, the kidneys perform vital roles for systemic health, including blood pressure regulation, electrolyte balance, and vitamin D activation. When kidney function declines, severe fatigue can set in, and poor circulation can reduce blood flow volume to the brain, producing dizziness. In addition, lower back pain is one of the classic symptoms seen when kidney qi weakens. While modern medicine often diagnoses this through weakened core muscles or disc problems, chronic stress and fatigue frequently induce systemic muscle tension and inflammatory responses that worsen lower back pain.
This autonomic nervous system imbalance ripples across multiple bodily systems like a vast, cascading waterfall. The heart-brain axis and kidney-brain axis are intimately connected, meaning problems in one system inevitably impact the other. Chronic stress and sleep deprivation degrade brain function, which in turn weakens emotional regulation and stress coping abilities, worsening the vicious cycle of anxiety and insomnia. Ultimately, when our body struggles to adapt to the fast pace and stress of modern society, it sends warning signals in diverse ways to protect itself. Listening closely to these signals and restoring bodily balance is what matters most.
