Although the spring is bright, the spring is chilly, and there is a cold wave raid in early spring. The sudden drop in temperature makes the human body out of balance and prone to illness. According to statistics, the blood pressure of hypertensive patients tends to fluctuate in spring, the incidence of stroke such as cerebral hemorrhage is high, and chronic liver disease, psychosis and chronic bronchitis are also prone to acute attacks. The weather is getting warmer and warmer, and bacteria and viruses are multiplying more and more. Even healthy people are prone to colds, coughs, stomachaches, vomiting and diarrhea, and feel exogenous pathogens. Therefore, we should follow the experience of the ancients, "spring is not afraid of cover, autumn is not afraid of freezing", and it is not appropriate to reduce clothes and quilts too early.