Yin-yang theory holds that everything in the universe has two aspects, namely Yin and Yang, which are both opposite and unified, and constantly moving and interacting. This kind of movement and interaction is the root of the movement and change of everything.

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Generally speaking, Yang represents things with dynamic, positive and strong attributes, such as: dynamic, strong, dynamic, exciting, positive, bright, invisible, functional, ascending, dew, light, heat, growth, life activities and so on. Yin represents the other side of things with static, immobile and soft attributes, for example, static, soft, immobile, restrained, negative, gloomy, tangible, material, declining, inward, heavy, cold, reducing and physical.

When two things are related, they can be divided into yin and yang. For example, the sky is yang, the earth is yin, the day is yang, and the month is yin; Fire is yang, water is yin, male is yang and female is yin; It's sunny during the day and cloudy at night.

Take an animal as an example, its body is yin and its life activity is yang; Its internal organs are yin and its exposed fur is yang; Its abdomen is yin and its back is yang.

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Third, the application of yin and yang in medicine

(a) the relationship between Yin and Yang and human anatomical parts: according to the above, the exterior is Yang and the interior is Yin; The upper part is yang and the lower part is yin; According to the law that the back is yang and the abdomen is yin, human fur is yang and viscera is yin. Yang on the head and Yin on the foot.

(2) The relationship between Yin and Yang and human physiology: Whether a person is healthy or not depends on whether Yin and Yang are harmonious, just as Neijing said: "Yin and Pingyang are the secret, and God is the rule". After eating and drinking enough, the human body transports nutrients to all parts of the body through the decomposition and transportation of the spleen and stomach, making the body grow strong and full of vitality. Tangible waste after food digestion is discharged from the front and rear yin. If the yin and yang of the human body keep balance, the human body will be healthy.

(3) The relationship between Yin and Yang and human pathology: After the imbalance of Yin and Yang, various symptoms will appear, and the ancient people also used Yin and Yang to express and explain the classification of symptoms. Yang syndrome, the general symptoms are: fever, thirst, rapid pulse and so on. This kind of symptom, the ancients also called heat syndrome (that is, yang syndrome). Yin syndrome, the general symptoms are: no fever, no thirst, cold hands and feet, delayed (slow) pulse and so on. This kind of symptom was also called cold syndrome (yin syndrome) in ancient times. This is what Neijing said: "Yang wins is hot, and Yin wins is cold".

On the other hand, the decline of yin and yang means that the imbalance of yin or yang is lower than the normal level, one of which is lower than the normal level, while the other is kept at the normal level, or both sides are lower than the normal level to varying degrees, so there is deficiency syndrome. Yin deficiency and yang hyperactivity lead to yin deficiency and internal heat; Yang deficiency is normal yin, and external cold is caused by yang deficiency; If both yin and yang are deficient in different degrees, then deficiency cold and deficiency heat coexist or both yin and yang are deficient. This is the syndrome of "yin deficiency causing internal heat, yang deficiency causing external cold" and "yin and yang deficiency" in Neijing.

(4) Application of Yin and Yang in diagnosis: Yin and Yang are the general principles of diagnosis. Although there are many diseases, their attributes are nothing more than yin and yang. For example, from the perspective of disease development, they are not in the exterior (Yang), but in the interior (Yin). From the nature of the disease: heat syndrome (Yang), cold syndrome (Yin), from the development trend of the disease: excess syndrome (Yang), deficiency syndrome (Yin). In a word, Yin and sum up the attributes of diseases.

(5) Application of Yin and Yang in treatment: There are many kinds of traditional Chinese medicines, but their nature is nothing more than Yin and Yang. In terms of medicinal properties, cold, hot, warm, cool and warm belong to yang, and cold belongs to yin. The general principle of treatment is "regulating yin and yang in order to be equal", which is the basic starting point of treatment. In view of the ups and downs of yin and yang, we should make up for their shortcomings and drain their surplus, so as to correct the abnormal phenomenon of the ups and downs of yin and yang and restore their relative balance. Traditional Chinese medicine often adopts the treatment principle of "cold is heat, heat is cold, but actually diarrhea, deficiency is tonic", so that the imbalance between yin and yang can be restored to relative balance. Clinically, the deviation of yin and yang of human body is corrected through the deviation of medicinal properties, so as to achieve "Yin and Pingyang are the secret and God is the cure". Clinical usage: ① Yang deficiency and yin excess are cold, and treatment: cold is heat (using hot medicine); (2) Yin deficiency and yang hyperactivity induce heat, and the treatment method: heat induces cold (using cold medicine); (3) Deficiency of healthy qi, treatment: deficiency should be supplemented; (4) Pathogenic factors are dominant, and treatment: diarrhea; ⑤ Yin deficiency and hyperactivity of yang, treatment: nourishing yin and suppressing yang; ⑥ Deficiency of both yin and yang, treatment: nourishing yin and helping yang (both yin and yang supplement).

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In addition, many diseases of modern young people are caused by improper diet (eating too much meat) and excessive sexual intercourse. Mastering these two problems, plus adjusting your mentality, don't worry about things going wrong, relax, and your body will get better gradually.