The paper presents modern regulatory requirements for the use of the Russian language as the state language, along with fundamental information on styles of written scientific discourse. The article delves into the essential demands for completeness and clarity in written language, which prove to be much stricter than in spoken language. The foundation of the work is built upon examples of the most common and typical linguistic errors, collected by the authors over many years of collaboration with editorial boards of medical journals and publishers. The article aims to assist authors in gaining a better understanding of the peculiarities of scientific speech style and enhancing the quality of printed works.