Baka wa kaze o hikanai

Baka wa kaze o hikanai (in Japanese: 馬鹿は風邪を引かない) is a Japanese proverb and urban legend that translates to,"idiots don't catch colds".

Origin
The phrase is said to have become popular during the Edo period (1600s-1800's).

Meaning
The phrase does not mean that certain people do not get sick, but it implies that carefree people are less likely to notice they are sick or to worry about being sick.