It is important to consider other neurobiological disorders related to ocd, esp. ADHD and conduct disorder, trichotillomania or Tourette syndrome. Very often a spectrum of comorbid disorders (including other disorders like body dysmorphic disorders) can be found. Secondary affective problems (depressive disorders) or anxiety problems (very often social phobia) and alcohol selfmedication can cause severe problems.
A small group of children and adolescents with OCD symptoms may have a so called PANDAS syndrome, obsessive-compulsive symptoms caused by an infection with streptococci.