Autumn marks the turning point between the heat of the summer and the cold of the winter. The cooling weather ushers in the harvest and heralds the dying cycle in nature. The seasonal change also causes the respiratory system to constrict, leading to cough, asthma, bronchitis, and even pneumonia. Chinese medicine has always associated autumn with the lungs and large intestine. The Yellow Emperor advises early to bed and early to rise, practice breathing exercises, avoid pungent flavors, but increase sour ones in the diet, drink fluids and eat soups, and remain calm and relaxed to avoid diseases typical of autumn.