Health care, as the name implies, is the maintenance of life, through health care methods, ways to enhance physical fitness, disease prevention and life extension activities. It also means to prevent diseases before they happen. According to the theory of Chinese medicine, the body should be nourished according to the changes of the four seasons. Chinese medicine says “spring and summer nourish Yang, autumn and winter nourish Yin”, meaning that spring is the season when everything revives, willows sprout, and rivers thaw, and the weather begins to turn warm, and the human body is the time when Yang Qi begins to develop. Yang energy is still weak, just like a child who is not yet mature and needs to be taken care of to avoid harm. The body’s yang energy also needs to be maintained and not to be grated, so dressing should be the first priority to keep you warm. Although the weather is starting to warm up, it is still cold, so if you remove your clothes too early at this time, your immature Yang energy will be harmed and you will be susceptible to disease in the summer. Also pay attention to nourishing the liver in spring, to be in a relaxed mood and emotionally stable. If you are emotionally unstable and prone to anger and irritability you will develop liver disease, such as upper gastrointestinal bleeding, which is more common. This is due to more anger hurting the liver, liver qi offending the stomach caused. In addition, the diet should pay attention to light, so that the yang energy to smoothly generate. Also pay attention to more exercise, the willow tree sprouts, everything revives is moving, the plan of the year lies in the spring, exercise can help to generate Yang Qi, Yang Qi is sufficient, the body will be healthy for a year. In summer, Yang Qi is the most vigorous time, just like people to the young and strong period, more attention should be paid to maintain this state, to speed up the body’s metabolism. Sweating is a form of metabolism, a time to excrete waste and build up strength, so don’t overdo the coolness. If you go against the characteristics of the season, it will cause the opposite, the body’s sweat shall not come out, the cold and damp gas will stop gathering in the body, to the autumn and winter seasons will be prone to diarrhea, chronic cough and other diseases. In the autumn and winter, it is a period when Yin and cold are dominant and Yang is restrained. In autumn crops begin to ripen for harvest, and as the saying goes, the golden autumn season is the season of harvest. Winter is the period when everything is sealed and hidden, animals begin to dormant, crops also begin to dormant. But dormancy, hiding is a period of accumulation of energy. People also need to rest and recuperate, to maintain the body’s essence, blood and fluids. You should go to bed early and get up early, don’t stay up late, eat warm and tonic food, be calm and quiet, and reduce all kinds of desires.