1. Yin deficiency is a term in traditional Chinese medicine. It refers to a series of pathological changes and syndromes caused by insufficient yin fluid, which cannot nourish and regulate yang. Clinical symptoms include low-grade fever, heat in the palms, soles, and palms, afternoon hot flashes, night sweats, dry mouth and throat, upset and insomnia, dizziness, tinnitus, red tongue with less coating, and thready pulse. Treatment is mainly based on nourishing yin.

If yin is deficient and fire is strong, it is advisable to nourish yin and clear away heat. Yin deficiency can be seen in lesions of multiple organ systems and tissues. Common ones include lung yin deficiency, heart yin deficiency, stomach yin deficiency, spleen yin deficiency, liver yin deficiency, kidney yin deficiency, etc., and may be seen together. The symptoms of each organ serve as the basis for diagnosis.

2. Yang deficiency (yangdeficiency), a term in traditional Chinese medicine. It refers to the pathological phenomenon of deficiency of Yang Qi in the body, hypofunction or weakness, decreased metabolic activity, low body reactivity, and insufficient Yang heat.

Yang Qi has the function of warming the limbs and internal organs. If Yang is deficient, the body's functions will decrease and signs of deficiency and cold will easily occur. Common ones include stomach yang deficiency, spleen yang deficiency, kidney yang deficiency, etc. The main symptoms of Yang deficiency include fear of cold, cold limbs, pale complexion, loose stools, long and clear urine, and weak and weak pulse.

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