In the Greek myth of Pandora, evils escaped immediately after she opened the storage jar. Hesiod says the container held destructive troubles that had previously been kept away from human life, and opening it allowed them to spread across the world.
The myth does not describe a modern hinged box or a single named monster emerging from it. Instead, the contents are personified or described collectively as illnesses, hardships, and other forms of suffering. The jar’s release explains why human beings experience misery even though the gods had kept such troubles contained before Pandora’s arrival.
The surviving account also says that one thing remained inside after the evils escaped: Hope. Interpretations differ over whether Hope is presented as a blessing preserved for humanity or as another troubling force held back by Zeus. The story’s imagery became a durable metaphor for an action that unleashes many consequences at once.