Transcript for Osbourne Seizure: Docs Give 'No Cause' Diagnosis
The alarming photo from tmz shows the startling moment after kelly collapsed on the set of her show and raced to the hospital thursday. But this morning the 28-year-old is resting at home. She says doctors tell her she had a seizure though they still don't know why. Osborne tweeted "my life is now like an episode of house the impending fight against death and look of fear in everyone's faces." Seizures can be caused by a lot of things and sometimes there is no cause for a seizure that's found. That's a beautiful -- Reporter: The star's health scare began when she said she didn't feel good and fell out of HER CHAIR WHILE TAPING E!'s Fashion police. Her mother sharon told her co-hosts on "the talk" the entire episode was recorded by cameras. It was filmed so it was -- we needed that to show the neurologist so they could see what was happening. She has had some medical issues, but nothing necessarily get get nick or been a problem. She's scheduled to return to work later this week. Her representatives saying doctors ran numerous tests and determined this was most likely a episode of which there are no conclusive results." Sometimes the seizure never recurs and sometimes it becomes a regular pattern and there's really no way to predict which one will occur. For now though her mom says she's just happy kelly is on the mend. She's on medication. She's fine. Nobody knows why she had it. But she is fine and naughty. And that is a good thing and we hope kelly keeps getting better and we're thinking about you, kelly. Pretty scary. I hope it is a one-time episode.
This transcript has been automatically generated and may not be 100% accurate.