Qin Zhizhen is a medical author included in this catalogue; the publicly available information about him is limited, and no clear record has been found of his birthplace, dates of birth and death, or medical training. All that is currently known is that one work by him, Shanghan Dabai (Plain Explanations of Cold Damage), has come down to us. Judging from its title and its classification, the book belongs to the tradition of scholarship on the Treatise on Cold Damage and discusses the system of pattern differentiation for cold-damage disorders established by Zhang Zhongjing, reflecting the author's attention to and study of the classic medical texts. Works of this kind typically focus on expounding the meaning of the classics, distinguishing patterns, and weighing formulas and medicines, in a concise and practical style meant for clinical reference. Because the historical sources are scattered and lost, Qin Zhizhen's full scholarly profile and later influence are difficult to examine in detail, but the existence of Shanghan Dabai shows that he had genuine insights in the field of cold-damage studies and left his reflections in writing. For readers studying cold-damage theory in Chinese medicine, the book can serve as material for understanding the character of cold-damage commentary in the Ming and Qing periods.
