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In the process of the occurrence and development
of a disease, there are always primary and secondary contradictions;
and the primary contradiction or the primary aspect of a contradiction
is the "root", while the secondary contradiction or the
secondary aspect of a contradiction is, comparatively speaking,
the "branch". The "root" has a dominating effect
on the "branch"; while the "branch" is subdominant
to the "root". When the genuine-qi and evil-qi are being
discussed, the genuine-qi is "root" while the evil-qi
is "branch"; when the cause of disease and its symptoms
are discussed, the cause is "root" while its symptoms
are "branch"; when pathological sites discussed, viscera's
pathogenic change is "root", while that in the superficial
parts of the body are "branch"; when the order of occurrence
of disease is discussed, old illness is "root", while
newly occurring illness is "branch"; and finally, primary
illness is "root", while secondary illness is "branch".
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