TV host Tracey Grimshaw has reportedly been flown to hospital after being thrown from her horse and suffering a blow to the head.

The ‘A Current Affair’ presenter was reportedly transported to Westmead Hospital in New South Wales on Thursday afternoon.

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“She landed heavily on her head and had been unconscious,” a CareFlight spokesman told the media.

Ms Grimshaw may have been unconscious for as long as 15 minutes before being treated by paramedics.

A Channel Nine spokesman has described her as being “fine, but still under observation”.

“The ACA team and everyone at Nine wish her a speedy recovery,” the spokesman said.