What is the meaning of wind, rain, cold, heat injury and fear of injury in five strains of Chinese medicine?

"Five pains" refer to blood injury caused by long-term vision, gas injury caused by long-term lying, meat injury caused by long-term sitting, bone injury caused by long-term standing and muscle injury caused by long-term walking. (Su Wenxuan's five qi articles in Huangdi Neijing) The "seven injuries" are sadness, anger hurting the liver, cold hurting the lung, full injury to the spleen, forceful lifting, sedentary wetland hurting the kidney, fear of violating peace, wind, rain, cold and summer injury. Generally speaking, these are all debilitating diseases. There are many reasons for "five strains and seven injuries", some of which are closely related to the "five flavors" of food, the "four seasons" of seasons and even the wind direction. Therefore, the theory of health preservation holds that in health preservation, we should pay attention to the proper amount of acid, sweet, bitter, spicy and cooked, and must not be partial to food; In daily life, according to the alternation of seasons and the change of temperature, we should add or subtract clothes at the right time, exercise properly and conform to nature. These are all necessary measures to keep fit and prevent "five strains and seven injuries". Ouyang Xiu Ceng Yun: "Take the way of nature and cultivate the body of nature." This is a fact.