There is no area of medicine in the broadest sense, or psychotherapy in the narrower sense, that is burdened with as many prejudices as hypnotherapy. And it is well known that every person is inclined to hold onto a prejudice rather than relinquish it for a well-founded judgment, even against better knowledge. This is a painfully evident result of social psychology research! Still, a little book about hypnotherapy? A fight against windmills? Hopefully not! I do not wish to write a scientific work on hypnosis or hypnotherapy. However, I would be glad if I could convey a small spark of my own enthusiasm for the practice of hypnotherapy to the three potential readers of this little book. I would like to explicitly encourage you: If you have a mental disorder, seek treatment from a good hypnotherapist.