What are the main causes of epilepsy?

"Possible causes include: traumatic brain injury, scarring on the brain after a brain injury (post-traumatic epilepsy),serious illness or very high fever, other vascular diseases,lack of oxygen to the brain,brain tumor or cyst,dementia or Alzheimer’s disease,maternal drug use, prenatal injury, brain malformation, or lack of oxygen at birth,infectious diseases such as AIDS and meningitis, genetic or developmental disorders or neurological diseases."