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Osbourne is now concerned she may be allergic to a specific food type and is to be examined by doctors in a bid to find out what is causing her health problems.

In a post on her Twitter.com page, she writes, "I'm so sick of having a bad stomach I am going for an allergy test next week to find out if I am eating something I am allergic to!"

Osbourne also fell ill with a vomiting bug on the set of her new movie So Undercover in January (11).