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Mr. Wang Youchun, a private tutor (Xixi), was from Xuyi and resided in Jiangba Town on the banks of Hongze Lake. One day he told me, "In our hometown, there is a disease called 'Sweat Disease' (Han Bing). It usually occurs between March and April. If one person contracts it, the entire household becomes infected, with simultaneous onset. Initially, the patient feels their hair standing on end, followed by fever, stupor, loss of consciousness, inability to speak, move, or eat. They only thirst for drinks, day and night without cease; if there are five or six patients at home, one person cannot possibly supply enough tea and water. By the sixth or seventh day, they must become severely manic and restless; recovery follows sweating. There is no medical treatment for it; if mania does not occur, death ensues. What disease is this?" I pondered for a long time and said, "This is Taiyang Shanghan (Cold Damage affecting the Taiyang channel)." It must be that the cold wind of winter combined with the moisture from the lake was inhaled through the mouth and nose, lying dormant in the Membrane Source (Moyuan, a location between the exterior and interior). Because it did not interact with the pathways of Ying and Wei (Nutritive and Defensive Qi) entering and exiting, it did not manifest immediately. When summer arrived, the Yang Qi of the Heart should ascend, but the latent Cold-Dampness struck directly against this process, obstructing the ascending Qi. Thus, they agitated each other, causing illness. Western medicine posits that injury to the brain's Qi results in the loss of perception and motor functions. Brain Qi relies on Heart Qi. The Heart Qi is suppressed by latent Cold, resembling Cold Damage directly attacking the Hand-Shaoyin (Heart) channel, a scenario not explicitly discussed by Zhang Zhongjing. In that winter, an abnormal wind carrying Water Pathogen arrived; those who contracted it developed this disease. Hence, it appears once every three to five years, likely related to Yunqi (Five Movements and Six Qi theory). Before illness onset, while pathogens lie dormant internally, there must be occasional heaviness in the head, dull pain and distension, and occasional sensations of chest oppression due to Heart Qi disturbance. Regarding treatment, Guizhi Tang (Cinnamon Twig Decoction) and Mahuang Tang (Ephedra Decoction) are inappropriate. Instead, Xiao Qing Long Tang (Minor Blue Dragon Decoction) combined with fluids-generating herbs should be used as the principal formula, because it contains Guizhi (Ramulus Cinnamomi) and Xixin (Asari Radix et Rhizoma), which enter the Heart to disseminate Yang Qi and disperse Cold-Water. For prevention, taking Guizhi Tang frequently during the month of Lichun (Start of Spring) would suffice. During the acute phase, the pulse must be deep, hidden, or invisible, or deep, tight, fine, and rapid. Prior to onset, the pulse must be tight and small, not vigorous. This is merely my speculative reasoning based on principles; I actually do not know the true meaning of 'Sweat Disease.' Later, upon reading Qianjin Fang (Prescriptions Worth a Thousand Gold), I learned that Sweat Disease is another name for Shanghan. Folk custom often claims medication is contraindicated and one must wait for spontaneous recovery, leading to many unnecessary deaths; this bad habit has existed for over a thousand years. Zhang Zhongjing's Bian Mai Lun (Treatise on Pulse Differentiation) states: 'When the disease reaches the sixth or seventh day, if the pulses at the hand and foot三部 (three positions) all arrive, accompanied by severe vexation, lockjaw preventing speech, and restlessness, this indicates the disease is about to resolve.' The clinical presentation matches this description, yet it does not specify what medication to use between the sixth and seventh days. Should one simply sit idle? If the pathogen is heavy and the disease manifests immediately with sudden collapse and unconsciousness, it constitutes Cold attacking the Hand-Shaoyin channel. (In my commentary on this passage in Bian Mai Lun, I stated that 'restlessness' is the key indicator; without it, vexation and lockjaw would indicate Qi collapse. Reading this clarifies the matter further.)"