Twenty-eight women working in the garment factory in Landhi area told police they had "seen" the ghost in a washroom.
The incident reportedly occurred on October 28 and police subsequently launched a probe but have not been able to make any headway.
"We treated around 28 women who had fallen unconscious or were semi-conscious when they were brought to the hospital," said Simeen Jamali, the medico legal officer of the state-run Jinnah Hospital.
One of the women who claimed to have seen the ghost, Shagufta, still sticks to her story.
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"I saw a big black ghost in the washroom. It resembled a shadow but was far bigger than any shadow I have ever seen," said the young helper in the factory's checking department.
Yasmeen, a senior worker at the factory, said the panic and pandemonium occurred after a few women came screaming out of the washroom and claimed that they had seen a ghost.