open a Pandora's box

open a Pandora's box

to do something that causes a lot of new problems that you did not expect
Usage notes: In old Greek stories, Zeus (= the king of the gods) gave Pandora a box that he told her not to open, but she did open it and all the troubles in the world escaped from it.
(often + of ) Sadly, his reforms opened a Pandora's box of domestic problems.
See also: box, open
References in periodicals archive ?
He told the hearing: "There are very strong views in Parliament that there must be stronger limits on the power of the press and this would therefore in my mind open a Pandora's box.
Although the murky conflict anchors the play, Shanley uses it to open a Pandora's box of questions about blind faith--another brand of "don't ask, don't tell"--that has kept the Catholic hierarchy in gear for so long.
I firmly believe it is extremely dangerous to open a Pandora's box with respect to marriage.
But if the agency plans to regulate herbal supplements as drugs simply because they contain some of the same compounds found in drugs, ``It'll open a Pandora's box, because botanicals contain hundreds of compounds.