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It is widely believed that paralysis on the left side is called "Tan" and on the right side "Huan," but this view is particularly incorrect. Why? Because the classics already record the condition of "Pian Ku" (hemiplegia or half-body immobility); therefore, the symptoms of Tan Huan should be named for cases where both the left and right sides are affected.

Another theory states that contracting this disease in spring and summer is difficult to treat, while in autumn and winter it is easier. The reasoning is: in spring and summer, Yang Qi ascends, and the fire energy is strong; wind and fire mutually reinforce each other and become dominant, making treatment difficult. In autumn and winter, Yang Qi descends and gradually weakens, making treatment easier. However, this view is not necessarily certain; the key lies in the depth of the pathogenic invasion determining the difficulty of treatment. The appropriate therapeutic method involves simultaneously regulating the Liver and Kidney, as the Liver governs the sinews and the Kidneys govern the bones; when Wind strikes the Liver and Kidneys, it leads to paralysis of the sinews and bones. (From *Jifeng Fang*)

Zhao Zhang, Chancellor of Yangxu Hou, fell ill and summoned Chen Yi (Chunyu Yi) for diagnosis. All other physicians believed he suffered from Cold invading the interior. Chen Yi palpated his pulse and said, "This is Feng Dong (sound 'dong', meaning pathogenic factors penetrating thoroughly into the four limbs)." Feng Dong refers to a condition where food and drink are swallowed but immediately regurgitated without staying. According to medical laws, death would occur in five days, yet he died after ten days. This illness resulted from drinking alcohol. I knew Zhao Zhang's condition because, upon palpating his pulse, it was slippery, indicating internal Wind Qi; combined with the symptom of immediate regurgitation after swallowing, the law predicts death in five days. The reason he survived past the predicted time is that he had a preference for congee, which kept his Zang organs full. Since his Zang organs were full, he survived longer. The master said: "Those who can digest food will survive beyond the expected period; those who cannot will die within the expected period." (From *Shiji*)

Sima, the Marquis of Qi, fell ill. Chen Yi palpated his pulse and informed him, "You will suffer from Feng Dong, characterized by defecation immediately after swallowing food and drink. This illness was caused by walking rapidly after a full meal." Sima said, "I went to the King's residence, ate horse liver, felt very full, saw wine being served, and immediately left. I drove my chariot swiftly home and then experienced diarrhea dozens of times." Chen Yi told him, "Drink Huo Ji Mi Zhi (Fire-Regulated Rice Juice), and you will recover in seven to eight days." At that time, Physician Qin Xin was present. After Chen Yi left, Qin Xin asked the attendants of the Ge Duwei, "What did Chen Yi diagnose Sima's illness as?" He replied, "He diagnosed it as Feng Dong, which is curable." Qin Xin laughed and said, "He knows nothing about medicine." By the law, Sima should have died nine days later, but he did not. His family summoned Chen Yi again. Chen Yi went to inquire about the condition, which matched his previous diagnosis exactly. He prescribed Huo Ji Mi Zhi again, and Sima recovered after seven to eight days. The reason I could predict this is that the pulse palpation fully accorded with the laws, and the disease pattern was favorable, hence survival. (*Shiji* ibid.)