The aim of this investigation was to evaluate the effects of cognitive therapy. Nine of 79 patients with Parkinson disease were selected for therapy. The 70 other patients served as controls. The two patient groups did not differ in terms of age, sex, or duration of illness or on the depression scales. None of the cognitive therapy patients had major depression. The 3 months of cognitive therapy contained both a written self-help programme and individual therapy sessions, based on the Psychological Profile Questionnaire. The results showed that the group receiving cognitive therapy had improved significantly more (P < 0.01) than the control group in such psychologic dimensions as Anxiety, Hopelessness, Recognition, Contacts, Ability, and Contained Anger. In conclusion, our preliminary results suggest that cognitive therapy based on nuanced psychologic assessment can be an effective treatment of emotional problems in Parkinson patients without major depression.