The press, making a mountain out of a molehill, precipitated an unnecessary economic crisis.

新闻界小题大做，促成了一场不必要的经济危机。

《柯林斯英汉双解大词典》

It's only a 2000 word essay -stop making a mountain out of a molehill!

这篇文章不过两千字而已，别再小题大做了！

youdao

So - making a mountain out of a molehill means making a small problem seem like a big one.

所以，用鼹鼠丘造山，其实就是把小事说成大事，言过其实了。

youdao

Tourism Minister Jim Mather hit back stating the Lib Dems were making a "mountain out of a molehill" over VisitScotland and were guilty of a "malestrom of further misinformation" on tourism.

BBC: Tourism debate