It is easy to catch a cold in the south/autumn and winter, which may be caused by low immunity or environmental factors, as follows:

1. Low immunity

The temperature difference between seasons is large, and because of its low immunity and poor body regulation ability, it can not adapt to greater climate change, thus increasing the chance of catching a cold.

2. Environmental factors

Secondly, during the season change, not only the temperature changes, but also allergens, such as pollen and rattan, will increase. Some patients with allergic rhinitis may also have cold-like symptoms such as nasal congestion.