The phrase “open Pandora’s box” most directly means to create what?

The phrase “open Pandora’s box” most directly means to create many unexpected problems.

In modern English, the expression describes an action that appears limited or harmless but unleashes a complicated series of troubles. It comes from the Greek myth in which Pandora opens a container and misfortunes spread into the human world. The phrase is usually used figuratively rather than as a claim that a literal box has been opened.

The wording became especially common through translations and retellings of the myth. Hesiod’s original account refers to a large storage jar, not a small box. The “box” wording reflects a long-standing translation history, particularly the influence of the Latin term “pyxis.”

The expression does not normally mean discovering wealth or receiving a reward. Its negative sense is the key distinction: the action releases consequences that are difficult to control or reverse.