Yin deficiency, a Chinese medicine term, refers to the pathological phenomenon of deficiency of essence and blood or body fluid. Because both blood essence and body fluid belong to yin, it is called yin deficiency, which is more common in patients with yin internal friction after a long illness or fever. Due to yin deficiency, fire can't be controlled. Getting angry will burn vaginal fluid and make it more virtual, and the two often interact with each other. The main symptoms of yin deficiency are five-upset fever or afternoon hot flashes, night sweats, zygomatic redness, emaciation, red tongue with little coating and so on. What are the specific manifestations of yin deficiency? Yin deficiency is mostly due to blood deficiency, and "Yin deficiency produces internal heat", which is manifested as five upset and hot, dry mouth and throat, upset and rough breath, and yellow and dry urine. Physical weakness, palpitation, shortness of breath, dizziness, poor mental state; Irregular menstruation, dull complexion, dark pigmentation, chloasma and butterfly spots breed; Menopausal distress; Entering menopause prematurely; Generally, it is more common in female officials, various hyperthyroidism diseases such as tuberculosis and long-term low fever. Yin deficiency is mostly caused by fever or prolonged injury after miscellaneous diseases, or dark yin consumption due to excessive five natures and excessive use of warm and dry products. If the yin deficiency is less, the body will lose its owner who nourishes and nourishes. At the same time, because the yin does not control the yang, and the yang is relatively strong, it will produce internal heat, so it is manifested as deficiency heat, dryness, dryness and annoyance. Yin deficiency can coexist with qi deficiency, blood deficiency, yang deficiency, hyperactivity of yang, deficiency of body fluid and dryness-heat, which is manifested as blood deficiency, deficiency of both yin and yang, deficiency of yin essence, deficiency of yin and body fluid, dryness in yin deficiency, and other yin deficiency can further develop into pathological changes such as yang deficiency, and the death of both yin and yang deficiency can lead to wind, qi, blood stasis and water stagnation. Traditional Chinese medicine believes that kidney deficiency can be divided into yin deficiency and yang deficiency, and the theory of kidney deficiency should be based on different studies of kidney yin and kidney yang. People with kidney yin deficiency often have symptoms such as lung heat, dry throat, soreness of waist and knees, dizziness, tinnitus and red tongue coating. Eat more cold foods in the diet, such as yam Gordon Euryale, honeysuckle, mung bean, cassia seed, fish soup and so on. People with kidney-yang deficiency often have symptoms such as chills in limbs, listlessness, backache and tinnitus, pale tongue and fat body. Mutton, velvet antler, cistanche deserticola, cinnamon and Alpinia oxyphylla should be selected to supplement them.