Ōhashi Shōin 大橋尚因 (also Ōhashi Genchiku 大橋玄竹; zì Hǎixī 海西; Sino-Japanese reading Dàqiáo Shàngyīn; fl. mid-Edo, 18th c., 江戶), Edo-period Japanese physician of Owari 張藩 (the Owari domain). Native of Owari; trained in Kyōto under a Koma 駒御醫 (Koma court-physician) lineage. By 1778 he had been practising for over forty years and was described by Tō Iin 滕惟寅 (Fuji no Korenobu) as about seventy — birth c. 1708. A specialist on shànqì 疝氣 (lower-abdominal pain syndromes and hernia complex). Author of the doublet pair KR3ek049 Shànqì zhèngzhì lùn 疝氣證治論 and KR3ek050 Shànzhèng jījù 疝症積聚 — two recensions of the same hernia treatise, both postfaced by Tō Iin in Anei 7 (1778). Ōhashi’s distinctive doctrine — grounding shàn in gān + shèn pathology + hán xié + jié qì, privileging Zhāng Zhòngjǐng-style direct formulae (Guìzhī jiā fùzǐ tāng, Dàhuáng fùzǐ tāng, Hòupò qīwù tāng) over SòngJīnYuán polypharmacy, and recognising shàn as the hidden cause of many “wrong-name” diseases — is a clear representation of the Koihō 古方派 / Han’igaku clinical method as applied to a specialist topic. CBDB does not cover Japanese physicians.