世界卫生组织对健康下的定义是：从生物学角度考虑，身体没有疾患，功能正常；从心理学角度考虑，有良好的心理状态，情绪反应适度；从社会学角度考虑，有良好的社会适应能力，不存在别人公认的不健康行为。“健康的一半是心理健康”。只有心理健康的人，才能以平衡的、正常的 The WHO definition of health is: from a biological point of view, the body no disease, normal function; from a psychological point of view, have a good psychological state, emotional response modest; from a sociological point of view, have a good social adaptation Ability, there is no other people recognized unhealthy behavior. “Half the health is mental health.” Only mentally healthy people can be balanced and normal