Colds in spring can be caused by temperature changes, dry air, and germs. 1. Large temperature changes: Because of the large temperature difference between day and night in spring, if you don’t add or subtract clothes in time, it may cause your body to be hot or cold, which may cause you to catch a cold easily. 2. Dry air: As the air is dry in spring, it may lead to dryness of the mucous membrane of the respiratory tract, which makes it easy to catch a cold in spring. 3. Germs: Since there are more viruses and other disease-causing microorganisms in the air in spring, if you don’t pay attention to wearing a mask and washing your hands, you may catch a cold easily in spring. In spring, it is recommended to take good protective measures in general. If you have a cold, you should go to the hospital in time.