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Differentiation of Syndromes
The goal of differentiation of syndromes is to identify changes in the functioning of the body and to know the nature of the disease by analyzing and judging the data obtained from the four diagnostic methods.  
There are many methods for syndrome differentiation, e.g. differentiation of syndromes according to the eight guiding principles, the cause of disease, the state of qi, blood and body fluids, the theory of zang-fu organs, the theory of six meridians, the theory of the wei, qi, ying, xue systems, the theory of triple energizer, etc.
Most important among those methods is syndrome differentiation according to the eight guiding principles, namely, yin and yang, exterior and interior, cold and heat, deficiency and excess.  By analysis of the site, nature and category of a disease the condition can be classified into the exterior, interior, cold, heat, deficiency, excess, yin and yang syndromes.


Differentiating Exterior and Interior Syndromes



It is a method used to determine the location of a disease and the development tendency of it.
Exterior and interior are two relative conceptions.  Skin, body hair, muscular interstices and meridians and collaterals are located in the exterior, while zang-fu organs, qi, blood and bone marrow in the interior.
An exterior syndrome refers to a syndrome due to an attack of the superficies by six weather conditions in excess through the skin, mouth and nose.  It is sudden in onset, superficial and mild in nature, and short in duration marked by fever, aversion to cold, thin white tongue coating, floating pulse and headache or general pain.
An interior syndrome refers to the pathological changes in the interior (zang-fu organs, qi and blood and bone marrow).  It is often seen in a severe condition with the zang-fu organs involved, characterized by abdominal distension and pain, constipation, or diarrhea.


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