"Researches have found that one-third to one-half of OCD cases identified in adults began during childhood" (Hyman and Pedrick 16). Most of the causes of OCD are biological.
"About half of all the people with OCD experience the symptoms in childhood. Among children, twice as many boys than girls demonstrate characteristics of OCD. For others, the disorder begins in adolescence or early adulthood. Interestingly, by adulthood, the male female ratio is almost fifty-fifty." (Boyles and Contadino 233).
Obsessive Compulsive Disorder has a variety of symptoms like contamination symptoms, symptoms related to performing tasks and intrusive fears and thoughts. Along with this symptoms can be of violent or aggressive thoughts, and inappropriate sexual thoughts. "Although people appear to be distinct dimensions in OCD, it should be noted that most patients report multiple symptoms that cut across dimensions" (Swinson 7).
With obsessions, "there are three common themes: unwanted thoughts of aggression/harm, unwanted sexual thoughts, and blasphemous thoughts" (De Silva and Rachman 4). In layman's language the symptoms include, some patients fear the presence of body secretions like sweat and saliva. Some symptoms related to performing actions repeatedly can be specific counting patterns or repeatedly washing the hands or clearing the throat. ...