Syndrome differentiation based upon yin-yang theoryis supposed to summarize and classify the commonly encountered symptoms and signs by analogy. But, humanbeing is an organic entirety and different diseases canpresent different features of syndromes. Therefore, thesyndrome differentiation cannot be limited in one aspectand should be conducted with comprehensive analysis incombination of different diseases. Only by this essentialpoint can it be possible to identify yin and yang. Besides,although there is certain yin and yang attribution in diseases, transformation between yin syndromes and yang syndromes can take place under certain conditions. Moreover, there is no pure yin and no pure yang. It is alsonecessary to understand that there is yang within yin and yin within yang and to differentiate the condition of yin and yang.

Differentiation of Tumefaction,Pain, Pruritus, Pus and NumbnessTumefaction, pain, pruritus, suppuration and numb-ness are the most commonly seen symptoms and signs inthe surgical diseases of TCM and can be caused by manyreasons. Therefore,to differentiate the different attribu-tion of the above-mentioned symptoms and signs can helpto identify different natures of the diseases for diagnosisand treatment.