Under the Weather

When someone says they are feeling "Under the Weather," they mean that they are not feeling well.
This idiom dates back to the late 19th century when it was a popular belief that bad weather makes a person ill. 

Similarly, we say catch a cold/have a cold. Mothers often tell us to dress warmly or we will catch a cold. However, scientists now say that cold weather does not play a role in getting sick. According doctors, we get a cold, not from being cold, but from germs.

What do you think?