Distinguish between yin-yang deficiency and heart-kidney deficiency. Syndrome of heart-kidney disharmony can be divided into four types: hyperactivity of heart-fire, kidney-yin deficiency, hyperactivity of heart-fire, kidney-yang deficiency, deficiency of heart-qi, deficiency of heart-qi and kidney-yin deficiency, namely, clearing heart to nourish kidney yin (such as Huanglian Ejiao decoction) and clearing heart to help kidney yang (such as Jiaotai pill).