OCD is where there is a compulsion to continually do something which inevitably leads to lifestyle problems. It's often accompanied by anxiety and depression and can be quite debilitating.

Hypnotherapy can be very useful in treating this condition, playing a large part in lessening both, frequency and intensity of the compulsions. 

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Christenson, G. A., Crow, S. J. (1996). The Characterization and 
Treatment of Trichotillomania. Journal of Clinical Psychiatry, Vol. 
57 Suppl 8, pp. 42-7; discussion 48-9. 
Trichotillomania is an impulse control disorder characterized by chronic self-directed hair pulling. Trichotillomania has additionally been viewed as one of the 
obsessive-compulsive spectrum disorders. Any body hair may be targeted, and most patients pull from more than one site. In clinical settings the disorder predominantly affects females. Onset is generally in childhood or adolescence, and a chronic course is typical. Depression and anxiety frequently accompany the disorder. An increased incidence of comorbid obsessive-compulsive disorder (OCD) has been noted. Neurobiological investigations have paralleled etiologic studies of OCD and have demonstrated both similarities and differences between these two disorders. Current treatment options include a variety of medications, particularly the serotonin selective reuptake inhibitors, the behavioural technique of habit reversal, and hypnosis. 

Kohen, D. P. (1996). Hypnotherapeutic Management of Paediatric 
and Adolescent Trichotillomania. Journal of Developmental & 
Behavioural Paediatrics, Vol. 17, 328-34. 
Trichotillomania in children is regularly described as analogous to a habit disorder. 
As such, it is thought at times to be benign in a manner analogous to habits such as 
thumb sucking and nail biting. It is also considered by some to be an obsessive-compulsive disorder, to be more recalcitrant to intervention, and to be more socially 
disabling than simple habits, particularly when persistence and intensity eventuate 
in obvious alopecia. This report presents five cases of trichotillomania in which 
self-monitoring, dissociative hypnotic techniques, and self-hypnosis (relaxation/ 
mental imagery) practice were used in teaching children successful management of 
this vexing problem. Specific emphasis is placed on the nature and importance of 
modifying the described techniques for the personal and specific developmental 
needs of individual patients. 

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