Why is there so much sickness in the wintertime?
One explanation is that we’re all cooped up inside. People are more susceptible to germs because they aren’t spending time outdoors like they do in warm weather.
Another reason is that some viruses thrive in cold temperatures. Winter air is crisp and dry which dries out your nasal passages and sinuses. Some doctors believe that these imposters recirculate in your heating system. When you inhale them through your dry nose, they enter your body.
Typically, your body secretes mucus to line your nasal passages and sinuses. This mucus traps germs and prevents you from getting sick.