The English writer Charles Dickens said that man is an animal of habit many other writers and philosophers have said something similar, and in the same way that we usually act mechanically in our daily lives, our brain works in a similar way. Man is an animal of customs, and those customs together with his habits of life create in him, in a historical way, some alterations, or in the worst of cases, mental illnesses, which we are going to deal with in this book. This book deals in a detailed way the History of Psychology and Psychiatry, and also contains 3 dictionaries, one of Psychology, another of Psychiatry and another of phobias, fears, manias and mental illnesses of all kinds. Once read this book, the reader will have self-diagnosed and he will realize that he is not 100%, nor as mentally healthy as he initially thought .....