The Emperor had been weak since birth, and in the record of "Shoku Nihon Koki" his medical history since age seven is listed; after his enthronement he often compounded medicines (Tanyaku, Ishiyaku), and his knowledge was as good as that of a doctor in his time.
天皇は幼少時から病弱であったとされ、『続日本後紀』には7歳の頃からの様々な病歴が記載され、即位後もしばしば薬（丹薬・石薬）の調薬をして医師並みの知識を有していたとされる。