"Muffling the body in spring and freezing the body in autumn" is a Chinese folk saying and the summarization of Chinese people's experience in health preservation as well. The saying means that people should not add clothing and quilts too early. At the beginning of autumn, summer heat does not vanish completely. When cool wind blows, people should add garments and quilts gradually, and never add too many at a time to muffle the body. In late autumn, though the wind soughs and signs, people should control clothing as well and consciously to let the body be slightly frozen deliberately. This can avoid perspiration due to wearing too many garments which cause sweat to consume yin and body fluids, make yangqi release outwards, and conform to the internal accumulation of yin and essence as well as the internal gathering of yangqi in autumn and prepare the conditions to store essence in winter as well.
Generally speaking, the climatic variations are relatively stable in autumn. But in late fall, particularly in September in the north, the cold wind and excessive rain, together with the increasingly intensified cold air make the temperature lower and lower. In this case, people are susceptible to common cold. Especially, the slow metabolism and poor circulation in old people make them fear both cold and heat. They are very sensitive to weather changes. More autumnal garments should be prepared to keep the body temperature constant by modifying the number of clothes instantly. Old people should pay more attention to keeping the hands and feet warm because of their poor peripheral circulation.