An intriguing connection can also be found from the perspective of modern medicine regarding the concept that the lung governs skin and hair in Korean medicine. Although the lung and the skin do not share a direct anatomical connection, research increasingly shows that they communicate closely through a complex network comprising our body's immune system, inflammatory responses, and autonomic nervous system. The skin is not merely an outer barrier, but our body's frontline defense that constantly interacts with the external environment, as well as a large immune organ. When the skin barrier is damaged, the penetration of external irritants becomes easier, triggering inflammatory responses that can lead to various skin diseases such as atopy, eczema, and psoriasis.
Here, the role of the lung becomes essential. While the lung is a vital organ that supplies oxygen and expels waste through respiration, it is also deeply connected to our immune system. Immune cells are abundant in the lymphoid tissue surrounding the lung, playing a major role in defending against external antigens that enter through the respiratory system. If lung function declines or enters a chronic inflammatory state, this can lead to a systemic immune imbalance. Furthermore, such an immune imbalance can amplify the skin's hypersensitivity reaction and worsen chronic skin inflammation.
In addition, one of the key links connecting lung and skin health is the autonomic nervous system. The autonomic nervous system regulates all involuntary functions in our body, and the balance between the sympathetic nerve activated during stress and the parasympathetic nerve responsible for rest and recovery is crucial. Chronic stress overactivates the sympathetic nerve, which constricts blood vessels, reduces blood supply to the skin, and can ultimately weaken skin barrier function. Moreover, sympathetic nerve activation increases the secretion of neuropeptides that promote inflammatory responses in the skin, becoming a primary factor that exacerbates xerosis cutis, pruritus, and allergic skin diseases such as atopic dermatitis.
This autonomic nervous system is closely tied to respiration. Deep, regular breathing through the lung activates the parasympathetic nerve and relieves physical tension, benefiting the skin. In contrast, shallow and irregular breathing stimulates the sympathetic nerve, aggravating the stress response and adversely affecting skin health. A dry environment parches the mucosa of the lung, which lowers the defense capacity of the respiratory system and leaves it vulnerable to inflammation. At the same time, it accelerates skin moisture evaporation, creating a vicious cycle that worsens xerosis cutis. Ultimately, modern science supports the idea that lung health exerts a profound influence on skin health through respiratory immunity, systemic immunity, inflammation control, and autonomic nervous system balance. Now is the time to look for the root cause of skin dryness and pruritus—which cannot be resolved by topical moisturizers alone—in lung health, and to consider the harmony of the entire body.
