Yunnan sudden death syndrome (YSDS) is an abruptly fatal disease of unknown etiology, found mostly in central or northwestern mountain area (with altitude between 1 815 and 2 225 meters ) of Yunnan province from June to September every year. It occurs mostly in young female adults, with high incidences in Lisu, Yi and Miao ethnics and high familial aggregation. The clinical manifestation of YSDS is changeful and the pathological characteristic is lack of specificity. The pathogenesis may be at-tributed to several factors including poor hygiene and lower socioeconomic conditions, lack of Selenium or Chromium, infection of Coxsackie B virus, mushroom consumption and special geological conditions. This article reviews the epidemiologic features, clinical manifestations, pathological features, etiology and hypothesis in order to provide clues for the research of YSDS.
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