Sharon Osbourne has admitted that doctors have yet to identify the cause of her sudden collapse last month.
The 70-year-old was filming an episode of son Jack Osbourne's series Night of Terror at a hotel in California when she passed out.
Osbourne was rushed to a nearby hospital but despite her taking numerous tests, doctors were unable to explain why she collapsed.
Returning to her show on TalkTV last night, she said: "I wish I could [explain] but I can't. It was the weirdest thing – I was doing some filming and suddenly they tell me that I... [passed out], for 20 minutes."
She added: "I was in hospital. I went to one hospital, they took me to another hospital and I did every test over two days and nobody knows why."
Osbourne appears on The Talk, weeknights at 9pm on TalkTV.
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