The onset of OCD in a child is influenced by genetic and environmental factors. The most common obsessive thoughts are associated with getting dirty, fear of injury, as well as obsessions about symmetry and exactness. The most common compulsive acts include washing, repetition, checking, counting, touching, arranging and collecting. The majority of children with obsessive-compulsive symptoms also exhibit other concomitant disorders. Cognitive behavior therapy alone or combined with SSRI medication is the essential mode of treatment. Complete recovery from individual episodes of OCD may take place, but in some the disorder continues until adulthood.