Describes some changes & problems occurring in adolescence. Constitution of the premorbid personality is based on self-esteem, incorporation of parental characteristics/standards, role functioning in the family, & cultural characteristics of the neighborhood. Common crises include school refusal, depressive illness, obsessive illness, runaway reaction, & delinquency. Impulsive suicidal gestures, & risk in depressive illness, might be treated by trycyclic antidepressants, rather than MAO drugs.