make a mountain out of a molehill
To blow an issue or event out of proportion: “You have only a small blister on your heel, but you complain as though you broke your leg. Why are you making a mountain out of a molehill?”
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Idioms and Phrases with make a mountain out of a molehill
Exaggerate trifling difficulties, as in If you forgot you racket you can borrow one—don't make a mountain out of a molehill. This expression, alluding to the barely raised tunnels created by moles, was first recorded in John Fox's The Book of Martyrs (1570).