Mikhail Khors – clinical psychologist, experience since 2006; laureate of the national award “Golden Psyche”; author and presenter of the program “At a Psychologist’s Appointment” on the Doctor TV channel; creator of “PSI-Internship”; member of the Union for Mental Health. We all, in one way or another, turn to various aspects of psychology. And this is quite natural - after all, no other science touches so many areas of human life. Taking care of your own psychological health is an integral part of the life of a modern person. However, there is no clear answer to the question “Who can be considered mentally healthy?” It is still not possible, and expert opinions vary. The author identifies criteria for mental ill health that will allow the reader to understand this important topic. “Mental Health from A to Z” is a kind of guide to human psychological health: from Withdrawal Syndrome to Toxic Relationships. Each chapter of the book is devoted to a separate problem and ways to solve it. You can read the book from A to Z, as the author advises, or work on a topic that particularly concerns you, paying attention to it first.