Yu Zhen, about whose life relatively little is known, is identified here only by the Chinese name Yu Zhen; his English name, nationality, and dates of birth and death are not clearly recorded. Publicly available sources show that one work by Yu Zhen survives, the Gu Jin Yi An An (a compilation of medical case records past and present), which is classified under medicine. A work of this kind typically collects the clinical experiences of physicians from earlier periods for later students to consult and learn from. It may therefore be inferred that Yu Zhen's writing was closely tied to the practice of traditional Chinese medicine and the compilation of medical cases, with attention to preserving and transmitting earlier diagnostic and therapeutic experience rather than to abstract theorizing. The available information does not establish his period, native place, or medical career, nor his specific place in medical history. Readers of the Gu Jin Yi An An should consider its structure and the physicians it cites in order to understand its editorial purpose, and should remain cautious about the author's biography.
