Great topic on correspondences and manifestations of yin and yang in the plain questions (Fifth article part III)

The doctor should inspect yin and yang, and discern softness from rigidity. When the yang is ill, treat the yin. When the yin is ill, treat the yang. Stabilize the blood and qi of all channels, so that they can act in their normal positions. When the blood is excess, bloodletting should be applied. When the qi is weak, lift and enrich it.

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