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It can be due to Birth hypoxia,heridetry, anatomical damage to brain,
Mostly cause is idiopathic.It may be due to some birth issues, brain trauma ,congenital,heriditery factors.
Could be overdose of substances and/ or misuse of drugs . Could be organic brain disorder and only after excluding the neurological and organic causes we look for psychological causes like Hysterical conversion or fits
Sleep deprivation and alcohol abuse.
Alcohol,drugs and"screenwork"(flashing light of all kind of (screen)devices.
Neurological defects.
Trauma and diabetes.
Metabolic defects.