Essential day-to-day knowledge for staff charged with the care of people with mental illness. The book contains the topics of the theoretical part of the IEK Certification exams for the specialty of Nursing People with Mental Illnesses. The answers to the questions are written in a simple, comprehensible, but also comprehensive way, with the aim of facilitating the study of students who want quick and meaningful results. However, the book is not only aimed at IEK students. It contains useful information for anyone who wants to gain knowledge about nursing people with mental illness, which may prove valuable in the future – both to themselves and their loved ones. The author of the book, Stavros Archontakis, is a Specialist Cytologist, Director of the Cytological Laboratory of the 401 G.S.N.A. He has worked for five years as a professor in a public IEK, teaching more than 600 educational hours of medical courses. He is a certified trainer from the National Certification Center and has been an examiner of the theoretical and practical part of IEK graduate certification exams.