More than 65 million people worldwide have epilepsy, according to the Epilepsy Foundation. Medication can be effective, but millions of people with the disease continue having seizures for the rest of their lives.
Several celebrities have been diagnosed with Epilepsy, including some that may surprise you.
Prince told PBS's Tavis Smiley in a 2009 interview: "I used to have seizures when I was young. My mother and father didn't know what to do or how to handle it but they did the best they could with what little they had."
The singer added: "My mother told me one day I walked in to her and said, 'Mom, I'm not going to be sick anymore,' and she said 'Why?' and I said 'Because an angel told me so.' Now, I don't remember saying it, that's just what she told me."
In 2013, Lil Wayne was admitted to the hospital after suffering three seizures back-to-back. He spent almost a week in the intensive care unit and finally opened up publicly about his ailment, saying that he has been suffering from epilepsy ever since he was a kid.
"The Matrix" star Hugo Weaving was diagnosed with epilepsy at age 13 but hasn't had a seizure since 1994.
He told the New York Post in 2012: "I probably had one major seizure a year. Every now and then I'd fall down and wake up to someone saying, 'Are you OK?', but it never affected any jobs I was doing.
"It started at 13, and I figured if I grew into it, I could grow out of it. I don't drive as a result, because I couldn't get my license."
Kelly Osbourne suffered a seizure on the set of "Fashion Police" in spring 2013, and doctors ran tests to determine if Ozzy's daughter had epilepsy. She reportedly went on a special diet meant for sufferers of epilepsy but hasn't revealed publicly that she's been diagnosed with the disease.