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The *Suwen* (Basic Questions), chapter "Yin-Yang Yingxiang Dalun" (Great Treatise on Yin and Yang Corresponding to Phenomena) states: The North generates Cold, and Cold transforms into Water. The *Suwen*, chapter "Zhiyao Dalun" (Great Treatise on the Most Essential Principles) states: All conditions of Cold causing contraction and pulling belong to the Kidney. The *Suwen*, chapter "Tianyuanji Dalun" (Great Treatise on the Origin of Heaven and Earth) states: Above the Taiyang (Greater Yang) channel, Cold Qi governs. Generally, from the Frost Descent solar term until the Spring Equinox solar term, it is precisely the time when Taiyang Hanwater (Cold Water) is in charge. If one encounters or冒犯 severe cold, the Taiyang Bladder Hanwater meridian (Foot-Taiyang Bladder Meridian) will be injured. Symptoms include headache, stiffness of the waist and back, fever, and aversion to cold. If neglected and not treated, the pathogenic transformation can take many forms. The pathogen ascends to empty orifices (orifices of the head and face) causing eye diseases, manifesting as cold tears, yizhang (corneal or lens opacity), and blurred vision. If complicated by Dampness, the pathogen stagnates in the Taiyin Spleen meridian, causing swelling of the eyelid flesh; if complicated by Fire, it damages Liver Yin, leading to the formation of white obstructions. If complicated by Wind, there is tearing upon exposure to wind, with cloud-like opacities covering the vision. If complicated by Phlegm, cherry-seed-sized nodules form on the eyelids, and the eyeballs become red and dry. If complicated by Stagnation (Qi constraint), the eyes feel tired and reluctant to open, Qi stagnation causes dim vision. Differentiating symptoms for separate treatment prevents omissions and errors. Even in cases where Cold is excessive and Heat arises, presenting with external signs of Fire, nourishing Yin and clearing Heat is appropriate. Overuse of Cold-Cooling herbs suppresses Yang Qi, inevitably leading to the stagnation of xingzhang (corneal nebula). However, this belongs to externally contracted Cold. If it is internal Cold, it is a disease originating from the body's own Zang-Fu organs. The *Suwen*, chapter "Yin-Yang Yingxiang Dalun" states: Excess of Yin leads to bodily coldness. The True Yang Qi of humans resides in the Right Kidney; when Cold, it cannot perform its function of strength (Zuoqiang), and skills/tactics do not emerge. When the Bladder is Cold, the Sanjiao (Triple Burner) Qi fails to transform, and water pathways do not flow. When the Spleen and Stomach are Cold, they cannot steam and rot (digest) food and drink, so the Five Flavors (nutrients) do not emerge. When the Liver and Gallbladder are Cold, the General (Gallbladder, governing decision-making) loses decisiveness, and strategies do not arise. When the Large and Small Intestines are Cold, transformation and movement fail, leading to constipation and urinary retention. When the Pericardium is Cold, Shenming (Spirit/Mind) declines, and one cannot respond to matters. The eyes are the essence of the five Zang organs, inheriting the true Qi of Heavenly Yang. If constrained by Yin-Cold, light is lost, vision becomes dim, internal obstructions cover the pupils, and warming and tonifying Qi and Blood to assist True Yang is indicated. The *Suwen*, chapter "Zhiyao Dalun" states: Treat Cold with Heat. It also states: Use Heat because of Cold (treating cold patterns with hot methods, sometimes involving specific administration techniques or addressing complex heat-cold interactions). It also states: For all conditions that become hot after being treated with Cold, treat them by drawing from Yin (nourishing Yin to clear deficient heat). Wang Haizang said: If heating therapy does not produce warmth, the fault lies in the absence of Fire; benefit the source of Fire to dissipate Yin shadows (pathogenic cold). Ginseng, Cinnamon Twig, and Aconite Root may be selected even in summer. One need not wait for water to freeze and earth to crack before diagnosing a true Cold syndrome. Additionally, there are various conditions such as Zhonghan (Cold strike), Fuhan (Latent Cold), and Hanxie (Cold complication), which differ greatly. Generally, the therapeutic principle lies in harmonizing Ying and Wei (Nutritive and Defensive Qi) and dispelling Cold and pathogens.