In the spring and summer of yin energy is weak, at that time dominated by yang; winter yin more than yang, says, "Lin-Shu." According to the "Su-Wen", spring - time of the year increasing vitality, abundance in nature, the revival of the time. During this period, the possibility of liver disease if a person is not adapted to the natural order of things. Summer - a time when the combined forces of heaven and earth. For this time of the year is characterized by the appearance of heart disease and "intermittent fever" (malaria). In the autumn of lost equilibrium between the forces of heaven and earth, and in this time of year it is subject to the lungs diseases. Finally, the winter - a time when the nature of the rest, and it was then often happen kidney disease. It was also noticed that windy spring contributes to diarrhea, and the summer heat is accompanied by fevers. Autumn moisture accompanies cough and cold winter can become a cause of fever, which appear in spring.