Hypnotherapy is a rather controversial topic in the area of psychotherapy. It is a form of suggestion that takes place on the subconscious level of the patient in order to elicit a change in behavior. Some people claim it does not work at all. Others argue that it is a highly effective therapeutic tool, while still more people claim that it can be dangerous to the person receiving the therapy.
The people who are concerned about the dangers of this type of therapy are generally ill informed about how it actually works. They are afraid that the patient will be open to all sorts of nefarious suggestions that could turn them into mindless monsters. That of course is just silly and there is absolutely no evidence available to give any credence to that thought.
If anything the clinical trials surrounding hypnotherapy indicate that it can be surprisingly effective in helping a person deal with various issues, or addictions that they may have. For example one of the common uses of this type of therapy is to help someone quit smoking. Other people have used it to help them get over their food addictions and to lose weight.
The truth is that the overall effectiveness of hypnotherapy is largely determined by the person who is submitting themselves to it. A person who is highly resistant or reluctant to enter into a hypnotic state, is not a good candidate for this therapy. It is something that a person really needs to enter into with an open mind.
Still because we are dealing with issues of the mind it is important to make sure that you vet your therapist carefully. You certainly do not want an inexperienced therapist of this sort mucking around with your mind. While it is doubtful that they could do any harm to you, it really is not worth taking the chance.