Kelly Osbourne has tweeted to say doctors are "trying to figure out" why the star had her seizure.
Tweeting an image of her arm, from what looks like a hospital bed, she said:
"Thank U all 4 UR beautiful well wishes yes I did have a seizure they are just trying to figure out why?"
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"I definitely get less money than a male in my situation would," she said. "Definitely."
Muscular Dystrophy UK said the lack of an option to label abusive tweets based on disability was preventing more reporting.