When making the decision to seek help and see a hypnotherapist, you are making the choice to change a behaviour that has developed. This pattern may have formed over time or come on quite suddenly, it is simply down to the brain forming a pattern that it recognises to access a reward by the release of chemicals in the brain.
Using Hypnotherapy the pattern of behaviour can be broken and the mind can be reprogrammed with alternative healthier reward pathways increased. It is the conscious mind that makes the decision to drink, take drugs, crave sexual activity or develop OCD behaviours with irrational thinking. The conscious mind will only do what the Unconscious tells it to, so with hypnotherapy the control room of the mind is accessed and reprogramming can take place. The unconscious is open to suggestion and reprogramming during the trance state of Hypnotherapy and this is how we form new patterns.