Traditional Chinese medicine (TCM) syndrome is an integral and essential component of TCM theory, and goes beyond philosophic concepts. This article reviews the concept of TCM syndromes and summarizes research findings on the biologic foundation of syndromes. In addition, insight is provided into the promotion of standardization of syndrome classification by enforcing uniformity of TCM terminology, applying standardized diagnostic criteria and operating procedures to minimize subjective effects. Also incorporating interdisciplinary approaches such as data mining and structure modeling, as well as integrating findings on biomarker research are discussed. Consideration is made of the fundamental TCM aspects of syndrome elements, symptoms, phenotypic features, as well as diseases, to form an integral process in the diagnostic path. We believe that better understanding of the biologic basis of the TCM syndrome and standardization of syndrome classification will improve diagnosis, which in turn will enhance therapeutic efficacy and disease prognosis.
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