This essay outline provides a comprehensive overview of the major mental health issues of depression and dementia. It covers the prevalence, impacts, and interventions for these conditions. The outline includes information on the signs, symptoms, and comorbid conditions associated with depression and dementia, as well as statistical data on their prevalence in Australia. It also discusses the factors responsible for the onset of these conditions and provides evidence-based interventions to address them. This study material is relevant for mental health courses.