Authors have studied 62 patients, aged 4-16 years old, who were admitted to the Moscow Children's Psychiatric Hospital №6. Patients had the following types of pathological interests depending on their context: intellectual interests, creative modeling, passionate, animalistic and cult. Three clinical variants of pathological interests depending on their structure have been singled out: «narrow», «overvalued» and «overvalued-delusional». These variants differed by the frequency and severity of basic components: affective, ideatory, specific activity drive. The distinct social-maladaptation effect of abnormal interests in children and adolescents was found. Its intensity depended on abovementioned variants. Narrow abnormal interests defined moderate social disability which was revealed in the family circle. Overvalued interests were characterized by a considerable disability which included disorders of both family and school life. Overvalued-delusional interests predetermined severe disability of children and adolescent.