Mental and behavioral disorders are disorders in the area of perception and behavior that require medical attention or hospitalization. Analysis of the incidence of mental and behavioral diseases and disorders showed that the most frequent disorders belong to the group of Neurotic, stress-related and somatoform disorders. Incidence analysis of disorders from that group in the Psychiatric ambulance of the Health Centre of Primorsko-goranska County is the main subject of this paper. Two central hypotheses of this research are based on the premise that mental disorders from the F40-48group are the most frequent in working class subjects, and that between these disorders most frequent ones are adjustment disorders and post-traumatic stress disorder. Results of the research showed that the incidence of the mental and behavioral disorders from the F40-48 group are the most frequent in working-class subjects, and that the most frequent disorders are the Adjustment disorders and PTSD Before the eighteen years of age disorder incidence is statistically irrelevant, and in the elderly most frequent are the adjustment disorders. Share of the adjustment disorders among other disorders is growing when the whole tested sample is analyzed. Research results showed that the disorders from this group are part of our everyday lives and that they must be prevented, recognized and treated. Education and communication are the guarantees of the successful treatment of the mental diseases in which the role of the nurse as the mediator between doctors and patients is invaluable.