First, drink more water. Drink at least 8 cups of boiled water a day to keep the respiratory mucosa moist and build the first barrier against the invasion of germs. Secondly, pay attention to keep warm and increase or decrease clothes in time with the change of temperature. Although it is spring, the climate is changeable, and sometimes the temperature difference between morning and evening is still very large. If you lose too many clothes at once, it is easy to reduce the immunity of human respiratory tract and provide an opportunity for the invasion of germs. Third, eat more foods rich in vitamin C, such as fresh fruits and vegetables. Don't eat spicy and sticky food to reduce irritation to respiratory tract. Pay attention to personal hygiene, wash hands frequently, change clothes frequently, and wash bedding frequently to ensure indoor air circulation. Seventh, insist on physical exercise, avoid overwork, enhance physical fitness and improve disease resistance.

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