 Sanches wrote treatises on medicine and philosophy, and of his philosophical works, only two were published in his lifetime, Quod nihil scitur (1581; That Nothing is Known) and Carmen de cometa anni M.D.LXXVII (1578; Poem of the Comet of 1577). The other philosophical writings were published by his sons in 1636, and they included De longitudine et brevitate vitae, liber; In liber Aristotelis physiognomicon commentarius; and De diviniatone per somnum, ad Aristotelem. All of which can be found in the various editions of his philosophical oeuvre—see the discussion at the beginning of the Bibliography.