"Preventing diseases before they occur" is a strategy to prevent diseases and preserve health, which was put forward as early as Huangdi Neijing. The word "not sick" first appeared in Su Wen's theological theory of four tones. "Therefore, a sage can cure an untreated disease, which is called' not sick'. Husband's illness became medicine, and chaos became a cure. It's not too late to cross a well and fight for a cone! " ; The word "preventing disease" appeared in two articles in Neijing. "Su Wen Zhe Re" said: "Although there is no disease, if you see a red man stabbing it, it is called treating it before it gets sick." The so-called "unexplored" here is actually a premonitory ailment, that is, a stage with few and mild symptoms, similar to what Sun Simiao said in the Tang Dynasty. In this case, timely detection and early diagnosis and treatment undoubtedly play a decisive role. The article "Ling Shu Jing Shun" says: "Workers stab the unborn; Secondly, the people who stab them are not rich ... they don't get sick when they go to work, and they don't get sick if they don't get sick. This is called "also". Both articles emphasize the need to seize the opportunity to treat diseases before they break out, so as to achieve the goal of "preventing diseases." "Preventing diseases before they occur" is the earliest concept of "prevention first" strategy that China health department has been following so far. It includes many aspects, such as nip in the bud, preventing the disease from changing and preventing the disease from changing gradually. This requires people not only to treat diseases, but also to prevent diseases, and to pay attention to the trend of preventing diseases, and to think of emergency methods that can be taken before diseases occur, so as to grasp the initiative of diseases and achieve them. Prevention and treatment is a method to prevent the occurrence and development of diseases through prevention or treatment. Prevention before illness has two meanings: first, prevention before illness emphasizes taking care of life and preventing the occurrence of diseases; The second is to prevent the spread of the disease after illness, emphasize early diagnosis and early treatment, and control the development and evolution of the disease in time.

"Prevention of disease" means:

(1) Pay attention to health and prevent diseases. In Huangdi Neijing, doctors of all dynasties attached great importance to the statement that "healthy qi should be preserved, and evil should not be done", and applied it through their own medical practice, making it a unique preventive medicine theory. Only by keeping fit can we prevent diseases, and only by paying attention to health preservation can we keep fit. The purpose of taking pictures is to adjust the spirit and will, keep quiet and undisturbed. Hide the essence in it, avoid excessive emotional changes, be cheerful and optimistic, so as to achieve the purpose of nourishing the true qi. For the abnormal climate and harmful pathogenic factors, we should avoid them in time, obey the changes of the four seasons, and maintain harmony with the external environment. People are required to eat moderately, live regularly and work hard, but they should not be overworked. At the same time, they should abstain from abstinence and preserve their essence. Oppose "taking wine as the pulp, running amok, getting drunk into the house, trying to exhaust its essence and dissipate its truth". Otherwise, it will lead to disease and premature aging. Besides, on the basis of long-term practice, we have created many effective fitness methods, such as Wuqinxi, Qigong, Tai Ji Chuan, Baduanjin and Yijinjing.

(2) Prevention of diseases. After the disease occurs, we must understand the causes and mechanism of the disease, grasp the development and change law of the disease from the outside to the inside, from shallow to deep, from simple to complex, and strive for the initiative of treatment to prevent its spread. For example, the method of invigorating spleen and stomach is used to treat liver disease, because liver disease is easy to spread to the spleen and stomach, and the method of invigorating spleen and stomach is to nip in the bud.

Physicians in past dynasties attached great importance to "preventing diseases". Sun Simiao was a great doctor in the Tang Dynasty. He attached great importance to treating diseases before they occurred. He scientifically divided diseases into three grades, namely, those who are not sick, those who want to get sick, and those who are already sick. He repeatedly warned people to "nip in the bud and cure the disease before it happens." His theory of preventing diseases mainly focuses on health preservation and disease prevention and treatment. His book Qian Jin Fang Yao contains a set of methods and measures to preserve health and prolong life, which is of great practical value. Yu was a physician in the late Ming and early Qing dynasties, and he knew the profound connotation of Zhongjing's thought of preventing diseases. His book "The Law of Medical Treatment" is based on the spirit of prevention before illness and early treatment. For example, Ginseng Buqi Decoction in Zhongfengmen is a preventive measure against exogenous wind; For example, the article "Blood Stasis and Fatigue" urges men to give up, hoping that their illness can be treated as soon as possible, instead of waiting for fatigue to get sick. It is emphasized that when fatigue can't be achieved, we should adjust Wei Rong, abstain from lewdness and lewdness, and every little makes a mickle, which makes fatigue difficult to become a useful person. Ye is a famous doctor in Qing Dynasty, who has made in-depth research on the prevention and change of diseases. He pointed out in "On Warmth" that "we should settle in a place where there is no evil". Epidemic febrile diseases belong to heat syndrome, which is easy to sweat, hurt body fluid and consume body fluid. Therefore, protecting body fluids and yin is a preventive measure and a positive measure to control the development of epidemic febrile diseases. Later, in Treatise on Febrile Diseases, the idea of protecting body fluids and preventing yin injury was put forward, which actually coincided with Ye's idea of "working in an innocent place" and embodied the idea of disease prevention. In addition, Hua Tuo in the Eastern Han Dynasty created the Five-Animal Play Fitness Method, and Ge Hong in the Jin Dynasty emphasized qigong health preservation and paid attention to physical fitness and disease prevention experience, which was also very valuable.