There is no difference between yin deficiency and yang deficiency, they are both concepts in Chinese medicine. 1. Yin deficiency: This is a condition in which a series of symptoms occur due to a lack of yin fluid, which cannot be nourished. Since yin deficiency cannot control yang, it often manifests itself in the form of yin deficiency and fire (deficiency of yin essence in the body, resulting in hyperactive fire), such as hot flashes in the afternoon (a burst of fever), heat in the hands, feet and heart, night sweating, dry mouth and throat, insomnia and heartburn, a red tongue with little moss, and a fine pulse (a pulse that becomes narrower and finer, and at an accelerated rate), etc. Treatment is mostly based on nourishing yin. Treatment is mainly based on nourishing yin, and in cases of yin deficiency and fire exuberance, nourishing yin and clearing heat (nourishing yin essence and removing heat) are recommended in parallel. Traditional Chinese medicine can be used to treat the condition, such as Liu Wei Di Huang Wan and Zhi Bai Di Huang Wan. 2. Yang deficiency: It refers to the symptoms caused by the deficiency of yang qi, which cannot be warmed. Yang has the function of warming the internal organs and limbs, therefore, Yang deficiency is often manifested as coldness, such as coldness and cold limbs (fear of cold, cold limbs), light mouth, no thirst, loose stools, long and clear urine, light tongue, heavy pulse, etc. The treatment is mostly based on warming Yang. Treatment is mostly based on warming yang, and Jin Gui Ren Qi Pills and Yu Gui Pills can be used. As you can see from the above, Yang deficiency and Yin deficiency are two different symptoms, so there is no question of which is more serious. In case of yin deficiency or yang deficiency, you should go to the hospital in time and get a clear diagnosis, then the doctor will arrange a scientific treatment plan, do not take it lightly or handle it by yourself, so as to avoid delaying the condition.