Meaning of the word "Pandora's box" in English

What does "Pandora's box" mean in English? Explore the meaning, pronunciation, and specific usage of this word with Lingoland.

Pandora's box

US /pænˌdɔːr.əz ˈbɑːks/
UK /pænˌdɔː.rəz ˈbɒks/
"Pandora's box" picture

Idiom

a source of extensive unforeseen troubles or problems

Example:
Opening up that old investigation would be like opening Pandora's box.
Reforming the healthcare system could open a Pandora's box of new problems.