[Coexistent depressive and anxiety disorders in neurological diseases: from a perspective of multimorbidity].

The high rate of coexistent emotional disorders in neurological diseases is challenging. As a rule this coexistence comprises a more dramatic subjective suffering, reduced psychological coping, possible negative interferences with somatic treatments and rehabilitation, an impaired quality of life and higher grades of psychosocial disability. It may also lead to an overall increased risk of somatic morbidity and even mortality in the further course of illness. The complex interrelations may be favorably integrated within a biopsychosocial model. Psychological and psychosocial stressors can be appreciated on their own discrete levels but have to be reflected in their neurobiological correlates. Both neurological and emotional disorders frequently share decisive pathogenetic mechanisms, i.e. the underlying process of neurological disease may contribute to major affective problems also in a somatopsychic direction. From a perspective of multimorbidity the prevalence and clinical relevance of coexistent depressive and anxiety disorders, common pathogenetic mechanisms and implications for treatment will be described for stroke and Parkinson's disease, as selected neurological disorders.