给“疾病”下定义是困难的,以致常引起人们的误解,韦氏(Webster)辞典的定义是“人体健康被损害的一种状态”.我们采用世界卫生组织(WHO)推荐的一种广义的概念,即疾病是病原导致机体一系列反应过程的后果.而在这个过程中所表现的症状则标志着机体功能的损害、缺陷和障碍.损害是指解剖、生理、精神状态或机体功能的不同程度的丧失或异常.缺陷是进一步导致个体在正常范围内的活动能力的限制 The definition of “disease ” is difficult and often leads to misunderstandings. The definition of Webster’s dictionary is “a condition in which human health is impaired.” We use the recommendations of the World Health Organization (WHO) Is a generalized concept that disease is the result of a series of pathologies that cause the body to react in a series of symptoms that manifest the impairment, defects, and impairments of the body’s function. Damage refers to anatomy, physiology, mental state Or varying degrees of loss or abnormality of the function of the body Defects are the limitations that further result in an individual’s ability to move within the normal range