What causes epilepsy?

Abnormal nerves. epilepsy is due to a group of nerves in the brain firing out of synchrony with the normal, firing nerves in the brain. can be caused by scar tissue in the nerves caused by any type of trauma, such as stroke, head injury, brain tumor, or some people for some reason are born with it. some theorize that people with epilepsy are born with the propensity to have abnormally firing nerves.