The rise and fall of Yin and Yang means that the two sides of Yin and Yang move and change forever on the basis of opposition and mutual roots, and the phenomenon of "Yin eliminating Yang and Yang eliminating Yin" appears constantly, which is the process of development and change of all things. For example, the climate change in the four seasons, from winter solstice to spring in Zhixia, gradually turns from cold to hot, which is a process of "yin disappears and yang grows"; From summer solstice to autumn winter, from hot to cold, it is also a process of "yang eliminating yin and growing long" Due to the ups and downs of Yin and Yang in the four seasons, there are cold, hot and cool changes. Everything can be grown and collected. If the climate loses its normal state and changes abnormally, disaster will occur. Clinically, different clinical syndromes are explained by the rise and fall of yin and yang (that is, the rise and fall of yin and yang). For example, cold belongs to yin and yin is abundant, so you will see cold syndrome, such as stomach cold, abdominal pain and diarrhea after cold; When heat belongs to yang, heat syndrome can be seen, such as acute pneumonia, high fever, thirst, skin redness and other acute fever symptoms. Some debilitating diseases are caused by deficiency of yin and yang rather than excess. If the yin of a viscera is insufficient, it is called "yin deficiency", that is, the yin disappears and the "yang" is relatively prominent. Because heat belongs to yang, yin deficiency leads to heat syndrome. This phenomenon is called "deficiency heat". If the yang of a zang-fu organ is insufficient, it is called yang deficiency, and the yin is relatively prominent at this time. Because cold belongs to yin, yang deficiency sees cold syndrome, which is called "deficiency cold"