In the idiom “to open Pandora’s box,” what does the phrase usually mean?

In the idiom “to open Pandora’s box,” the phrase usually means to unleash many problems.

The expression comes from the myth in which opening a sealed vessel releases troubles into the human world. In modern English, it describes an action or decision that creates a cascade of complicated, harmful, or difficult consequences. The phrase is often used in journalism, politics, law, science, and everyday conversation.

The idiom is metaphorical rather than a reference to a real container. It also does not necessarily mean that every consequence is immediately visible; speakers may use it for a decision whose risks emerge gradually.

The wording preserves the translation tradition that turned Hesiod’s large jar into a box. As a result, the modern expression combines an ancient Greek narrative with a Renaissance-era terminology change. Its meaning remains stable even when retellings alter the story’s details.