Trephining was a historical and primitive treatment for mental illness that involved drilling a hole in a person's skull.

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Trephining was a real historical practice, used as far back as the Neolithic era. It is thought to have been used to relieve intracranial pressure, as well as to treat mental illnesses or other conditions thought to be caused by spirits or demons. Though it is no longer considered an effective treatment, evidence of trephination has been found in archaeological sites all over the world.

Trephining Was a Historical and Primitive Treatment for Mental Illness