Condition is fairly common and can start at any age
This weekend, epilepsy charities around the world will mark Purple Day - an international grassroots effort dedicated to increasing awareness about the condition.
Epilepsy is fairly common and can start at any age.
It affects the brain and causes frequent seizures, which are bursts of electrical activity in the brain that temporarily affect how it works.
Bethany de Legh-Runciman is the secretary of EPSAiom - the Epilepsy Charity.
She says it's important for people to learn the signs and symptoms - and if you see someone having one, don't leave them alone: