When Your Hands and Feet Are Always Icy Cold

Looking at the concept of 'blood' as discussed in Donguibogam (Principles and Practice of Eastern Medicine) through the lens of modern medicine reveals a remarkably scientific insight. The blood we commonly think of as 'blood' goes beyond simply transporting oxygen and nutrients; it is deeply involved in our body's thermoregulation, immune response, inflammation regulation, and even pain perception. When experiencing cold hands and feet, the first thing that comes to mind is likely 'peripheral circulatory disorder'. Indeed, when the small blood vessels at the ends of your hands and feet contract and blood flow volume decreases, your hands and feet become cold. However, it is our body's 'autonomic nervous system' that accommodates this vasoconstriction. The autonomic nervous system is divided into sympathetic and parasympathetic nerves, and when the sympathetic nerve is excessively overactive due to stress or overexertion or overwork, vasoconstriction occurs and blood pressure rises, putting the body in a state of tension, as if entering battle. At this time, blood flow to the hands and feet decreases, making maintaining body temperature difficult and causing a sensation of coldness. Especially women tend to have a more sensitive autonomic nervous system reaction due to the effect of hormones, experiencing cold hands and feet more commonly. What about the accompanying headache? Poor blood circulation doesn't just mean coldness. It can also be connected to pain that occurs during the cerebrovascular constriction and dilation process, or to 'tension headache' caused by tension in the neck and shoulder muscles. Specifically, the concept of blood stasis, meaning blood becoming stagnant and waste products accumulating, can be interpreted as similar to inflammatory substances or thrombogenesis in modern medicine. If blood becomes viscous or injury or damage occurs in the vascular endothelium, blood flow resistance increases, which obstructs microvascular circulation, leading to tissue hypoxia and nutritional imbalance. At this time, it can stimulate surrounding nerves, inducing headaches or other pain. If blood supply to the brain is not smooth, it can lead to feelings of fatigue due to a decline in brain function, and even decreased concentration. Furthermore, chronic stress promotes adrenocortical hormone secretion, which can promote vasoconstriction and a pattern known as 'Heart Fire Cold Hands and Feet'. Additionally, autonomic nervous system imbalance manifests as decreased digestive function, sleep disorders, and other systemic symptoms, disrupting the overall health balance of our body. Ultimately, Donguibogam's emphasis on 'blood' can be interpreted as a holistic view of our body's complex accommodation mechanisms, including not only the physical circulation of blood as discussed in modern medicine, but also the autonomic nervous system, hormones, and immune system. Cold hands and feet and headaches are more than just discomfort; they can be an urgent signal from your body crying out, 'Please, let me rest.'