Generally, in winter and spring, autumn and winter when the temperature changes suddenly, hot and cold, the temperature difference between morning and evening is relatively large, people do not put on and take off clothes in a timely manner, or in summer when it is too hot, the use of air conditioning indoor and outdoor temperature difference is also easy to get sick.
In addition, people who are overly tired, such as staying up late and working overtime, are more depressed, anxious and irritable, and smoke and drink are also more likely to get sick when their body resistance is reduced.