Definition & Meaning of "make a mountain out of (a) molehill"in English

What is the origin of the idiom "make a mountain out of a molehill" and when to use it?

The idiom "make a mountain out of a molehill" originated in the 16th century and has been in use since then. This phrase draws upon the contrast between a tiny molehill, which is a small mound created by burrowing animals, and a towering mountain, highlighting the tendency of some individuals to amplify the importance of minor matters, often causing unnecessary worry or concern.