mental disease

(4)SenilePeriod the symptom of mental disease is extremely flabby calm, be fantasticality sometimes.

(4)老年期精神疾病症状极不稳定，有时是变化无。

Depression is a common thymogenic mental disease with prominent and persistent low mood as its major clinical feature. It becomes a common disease and frequently encountered disease in modern society.

抑郁症是一种以显著持久心境低落为主要临床特征情感性精神疾病，已成为现代社会病、多发病。