Usually the main side effect of hypnotherapy is that you are left feeling calmer and more relaxed! Hypnosis is safe. Hypnotherapy is simply about guiding you into a relaxing trance-like state. In fact, when you think about it you are often in a similar trance state on a daily basis. Just think of times you have been sleepy but not quite asleep yet, engrossed in focused concentration, been preoccupied daydreaming or found your mind wandering during a conversation or class. These are all examples of being in a type of trance, very similar to a hypnotherapy (hypnosis) trace state.
The difference is that you were not guided into the trance by a therapist. Hypnotherapy is safe and suitable for both adults and children.