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Sudden death refers to true death. It typically occurs within moments, half a day, or one to two days. If it is not due to stroke or syncope (Zhong Feng), revival may be possible.

The *Ling Shu* records: The Yellow Emperor asked, "What causes sudden death or acute illness?" Master Shao answered, "When the 'Three Deficiencies' (San Xu) are present, death occurs suddenly and rapidly. When the 'Three Excesses/Realities' (San Shi) are encountered, pathogenic factors cannot harm the human body." The Yellow Emperor said, "I wish to hear about the Three Deficiencies." Master Shao said, "When the year's qi is deficient (Cheng Nian Zhi Shuai), coinciding with the waning moon (Feng Yue Zhi Kong), and failing to harmonize with the seasonal climate (Shi Shi Zhi He), one is then injured by thieving wind (Zeifeng). This is called the Three Deficiencies. Therefore, if physicians do not understand the Three Deficiencies, they remain crude in their practice." The Yellow Emperor said, "I wish to hear about the Three Excesses." Master Shao said, "When the year's qi is abundant (Feng Nian Zhi Sheng), coinciding with the full moon (Yu Yue Zhi Man), and obtaining the harmony of seasons (De Shi Zhi He), even if thieving wind and pathogenic factors exist, they cannot endanger life." (From *Su Wen: Sui Lu Pian*)

When the Three Deficiencies combine, they lead to acute illness and sudden death. (The full text is found in discussions on diagnosing illnesses based on annual patterns.)

There are four types of sudden death and acute illness caused by Five Movements and Six Qi (Yunqi):

First is Deficiency (Xu). The classic states: "How are the six positions of qi盈 (full/excessive) and empty?" Qibo answered, "They differ greatly between excess and deficiency. The arrival of excess (Da) is slow and constant; the arrival of deficiency (Shao) is violent and fleeting." Although 'sudden' refers to the nature of the arriving qi, the pathological qi is contained within it.

Second is Fire (Huo). The classic states: "When fire depression erupts (Huo Yu Zhi Fa), severe cases involve chest oppression and restlessness (Ao Nu), leading to sudden death." It also states: "Where Shaoyin (Lesser Yin) arrives, sudden death occurs." Furthermore: "When Shaoyang (Lesser Yang) governs the Heavenly Qi (Si Tian), during the third phase (San Zhi Qi), intense heat and summer heat arrive, causing the people to suffer from sudden death." Also: "When Yangming (Greater Yang) governs the Heavenly Qi, during the second phase (Er Zhi Qi), warm and pestilential qi prevails, and the people are prone to sudden death." Additionally: "Where Shaoyang arrives, it manifests as acute illness."

Third is Wind-Fire (Feng Huo). The classic states: "When Shaoyang governs the Heavenly Qi, fire qi descends, and wind moves on the earth; its onset is sudden and rapid." It also states: "When Jueyin (Terminal Yin) governs the Heavenly Qi, wind qi descends; its eruption is swift like a trigger mechanism, characterized by sudden changes and urgency. The diseases arising from this occur with extreme speed."

Fourth is Metal (Jin). The classic states: "Excessive Metal is called 'Solid Formation' (Jian Cheng). In years of Solid Formation, the movement involves sudden fracture/breakage (Bao Zhe), sores, and infectious diseases (Zhu Zhu)." This represents Metal combined with Fire transformation. Metal governs breaking/fracturing, while Fire governs suddenness/violence.

The *Ling Shu* records: Lei Gong asked, "How can we know why a person dies suddenly without prior illness?" The Yellow Emperor answered, "When Fire Qi enters the Zang-Fu organs, death occurs suddenly without preceding symptoms." Lei Gong asked, "How can we know why a person dies suddenly after a minor illness has seemingly improved?" The Yellow Emperor answered, "If red color appears on both cheekbones (Liang Quan), the size of a thumb, although the illness seems slightly better, sudden death is inevitable. If black color appears on the forehead center (Ting), the size of a thumb, death will occur suddenly without prior illness." (Red appearing on the cheekbones corresponds to the pulse manual's description of 'acute illness presenting with makeup-like flush, indicating life is short,' referring to false spirit phenomena. From *Su Wen: Wu Se Pian*)

The Foot-Taiyang Bladder Meridian originates at Zhiyin (BL67) and terminates at Mingmen. Mingmen refers to the eyes. The Taiyang meridian governs 'Opening'. If the Opening function collapses, muscle joints become lax and disordered, leading to the onset of acute illness. Therefore, for treating acute illness, one should select points from the Taiyang meridian and assess whether there is excess or deficiency. 'Du' refers to the flaccidity and weakness of skin and flesh. (From *Ling Shu: Gen Jie Pian*)