Other times it can be due to injuries or complications at birth. During these times the hurt areas of the brain interrupt the natural flow of things. Remember all the nerves in our bodies are connected in one way or another. The brain no longer understands what the eyes are seeing. Leg muscles can become weak.
Muscle tone is lost and people can fall.
Epilepsy has many different causes. That is why it can be so difficult to figure out. These cases are referred to as idiopathic or crypotgenic epilepsy. This type of epilepsy would be what is called hereditary. It is usually found early in life.