In Hesiod’s Works and Days, Pandora brings evils to humanity when she opens the container.
Hesiod describes the troubles of human life as being released from a covered vessel after Pandora opens it. The passage names or evokes diseases, toil, and other forms of suffering that had previously been kept away from mortals. The Greek text calls the contents evils rather than presenting the later, simplified phrase “all the evils of the world” as a precise quotation.
The story functions as an etiological myth: it explains why human beings experience hardship, illness, and exhausting labor. Pandora’s action is the immediate trigger, while Zeus’s plan is the larger cause.
Modern retellings often say that Pandora “let evil into the world.” That wording captures the broad idea, although Hesiod’s account is more specific about evils escaping from a vessel. The story’s famous surviving quality is treated separately in later interpretations and is not the answer here.