What is epilepsy? Epilepsy is a condition that causes people to have repeated seizures. Seizures are caused by abnormal electrical activity in the brain. Seizures can make you pass out, or move or behave strangely. Epilepsy can start at any age.The good news is that epilepsy is treatable. For most people with epilepsy, seizures will be completely controlled on medication. It is important to learn about epilepsy, your medication, and lifestyle issues. What are the symptoms o