医学是以治疗预防生理疾病和提高人体生理机体健康为目的。狭义的医学只是疾病的治疗和机体有效功能的极限恢复，广义的医学还包括中国养生学和由此衍生的西方的营养学。无论是中医还是西医，从诞生至今，主要作用还是治已病。二十世纪末，全球医学界大讨论最终结论是：最好的医学不是治好病的医学，而是使人不生病的医学。
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