I have a girlfriend who has had 3 seizures in her lifetime. I think she's 47 years old. She had one a few weeks ago. The last time previous to that was 8 years before. She's had every kind of test and they have never found a reason for it. She is on anti-seizure meds since the last one I think. Sometimes the medical profession just can't find a cause for things. They don't know everything unfortunately.