Hypnotherapy is a common form of complementary therapy. The process in itself is very simple and pain free. Hypnosis is usually done with the help of a hypnotherapist using verbal repetition and mental images.
The trance (see below for more explanation) is a part of the hypnotherapy proses. When activating a trance in hypnotherapy, the client becomes more responsive to any suggestions given to him/her under the hypnotherapy process. These suggestions make the change(s) in the client.
The effect of a hypnotherapy is mainly long lasting if not life long lasting. It extends to the conscious state of the mind by relaxing it, while slowly stimulating it.