The "March 9th" is the coldest season of the year, and the "winter disease" closely related to the decrease in temperature has also entered a high incidence period. Experts suggest preventing cardiovascular and respiratory diseases, keeping warm, drinking plenty of water, and ensuring adequate sleep in daily life. Wang Xiaofei, chief physician of the Department of General Medicine at Tianjin First Central Hospital, stated that the human respiratory system and cardiovascular system are most sensitive to temperature changes. From January to early February each year, especially before and after the cold wave, cardiovascular diseases such as coronary heart disease and cerebral infarction, as well as respiratory diseases such as chronic obstructive pulmonary disease and asthma, are at high risk, with an increase in related cases and a relatively high proportion of middle-aged and elderly patients. Wang Xiaofei suggests that in winter, one should be vigilant about cardiovascular and respiratory diseases, and pay attention to keeping warm in daily life to ensure sufficient sleep. The temperature difference between indoor and outdoor in the north is large, and coupled with dry weather, it is necessary to ensure daily water intake. Elderly people, pregnant women, infants and young children, and those with underlying diseases such as cardiovascular or respiratory diseases should minimize the stimulation of alternating cold and hot environments as much as possible, closely monitor their physical condition, and seek medical attention promptly if discomfort occurs. Chronic disease patients need to adhere to medication, actively control underlying diseases, regularly measure blood pressure and blood sugar, and seek medical attention promptly if there are abnormal fluctuations. In addition, due to the cold winter weather, extra attention should be paid to physical exercise. Experts suggest that winter exercise should be done according to one's ability and gradually, avoiding excessive fatigue, focusing on warm-up before exercise and relaxation activities after exercise, and also paying attention to moderation and warmth during exercise. (New Society)