精神病是一個重要的公共衛生議題，這不僅可致個人痛苦，更能造成巨大的家庭與社會成本。研究發現，精神病在社區裡並不罕見。生理、心理和社會因素，全都可以促成精神病之出現，評估和治療精神病時也應該充分考慮這些因素。一個人出現精神病，往往不會是單一原因造成的。生理因素(e.g., 基因影響和化學失衡) 和心理社會因素(e.g., 創傷、孤獨、家庭關係、貧窮) 皆可是重要成因。至於精神病的治療，生物醫學治療(e.g., 藥物治療) 和心理社會介入方法 (e.g., 認知行為治療) 皆可能有幫助。然而，誤解和污名是社區裡之障礙，可延誤為患有精神病的人提供適當評估和治療。
Mental illness is an important public health issue as it not only could lead to personal suffering, but also lead to huge family and social costs. Studies show that mental illness is not rare in the community. Biological, psychological and social factors could all contribute to the development of mental illness, and these factors should be taken into consideration when assessing and treating mental illness. Usually, there is no single cause for a person who develops a mental disorder. Biological factors (e.g., genetic influences and chemical imbalance) and psychosocial factors (e.g., trauma, loneliness, family relationship and poverty) may all play an important role. In terms of treatment for mental illness, both biomedical treatments (e.g., medications) and psychosocial interventions (e.g., cognitive-behavioral therapy) may be very helpful. However, misunderstanding and stigma are obstacles in the community which could lead to delay in providing appropriate assessment and treatment for persons with mental illness.