Hé Xuàn 何炫 (zì Lìngzhāo 令昭, 1662–1722, Qing physician of Qīngpǔ 青浦, the Shanghai region), eighteenth-generation representative of the Qīngpǔ Héshì 何氏 hereditary medical lineage — one of the longest documented family-medical traditions in late-imperial China, running across nearly thirty generations.
His principal medical work is the Héshì xūláo xīnchuán 何氏虛勞心傳 (KR3eh036, 1 juǎn) — a jiāchuán 家傳 monograph on consumptive disorders (xūláo 虛勞), with a zǒnglùn 總論 framing the etiology as five-organ exhaustion of zhēnyīn 真陰 (true yīn) and a famous qīwù 七誤 (“seven mistakes”) chapter cataloguing common mistreatments — yǐnhuǒ guīyuán 引火歸元, lǐzhōng wēnbǔ 理中溫補, shēnqí zhùhuǒ 參耆助火, kǔhán xièhuǒ 苦寒瀉火 etc. Hé’s central thesis — that xūláo is fundamentally a zhēnyīn deficiency that wēnbǔ worsens, against the SòngMíng bǔyáng mainstream — became foundational for the Qing-era Héshì lineage.
The CBDB entry for 何炫 (id 294233, index year 1470) is a Ming homonym, not the medical author; the medical Hé Xuàn lacks a CBDB record. Lifedates here follow the consensus of the Qīngpǔ family genealogies and the standard medical biographies (Lǐ Jīngwěi 1988).