Pandora’s jar released evils into the world when she opened it. In Hesiod’s account, the container held harmful forces that had previously been kept away from humanity.
The myth uses the opening of the jar to explain why people experience illness, hardship, toil, and other forms of suffering. These troubles spread outward after the lid is removed, while one final thing remains inside.
The story is not simply a warning about curiosity. In Hesiod’s larger narrative, Pandora’s arrival is part of Zeus’s punishment for Prometheus’s theft of fire, so the jar episode belongs to a divine conflict about humans and the gods.
Later versions often call the contents “all the evils” or “the world’s troubles.” The exact list varies, but the central idea is consistent: Pandora’s action releases suffering among mortals.