What is the common modern meaning of the phrase “open Pandora’s box”?

The common modern meaning of “open Pandora’s box” is to create unforeseen troubles.

The idiom comes from the myth in which opening a sealed vessel releases suffering into the world. In modern English, it describes an action that begins a chain of complicated, harmful, or difficult consequences that were not fully anticipated. It is usually used figuratively rather than as a reference to Greek religion.

The phrase can apply to politics, technology, law, family disputes, or any situation in which addressing one issue exposes many more. It does not require literal danger, and it does not necessarily mean that the original action was malicious. The emphasis is on consequences that are difficult to control once the process starts.

The expression is often confused with “skeletons in the closet,” which refers to hidden embarrassing facts. Pandora’s box instead focuses on the consequences released by an action. The English wording also reflects later retellings, since Hesiod’s original vessel was a jar rather than a box.