Kelly Osbourne suffered a seizure on the set of "Fashion Police" last week, and doctors are trying to determine if it was a sign a serious medical condition.
The reality star has remained in the hospital since the incident last Thursday. The 28-year-old let fans know she was okay, tweeting a photo of her arm with an IV in her arm. She wrote on Friday: "Thank U all 4 UR beautiful well wishes yes I did have a seizure they are just trying to figure out why? http://t.co/pyZV4rDXsY."
On Monday, she posted: "My life is now like an episode of House = the impending fight against death and the look of fear in everyones faces!"
According to TMZ.com, "the seizure was far more serious than first suspected. Doctors are running tests and we're told she'll be in the hospital for at least a few more days."
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.
Kelly's brother Jack is also dealing with health issues - last year he was diagnosed with multiple sclerosis.