Actress Emilia Clarke has been hiding a secret health crisis after she was reportedly diagnosed with a brain aneurysm earlier this year (13).

The Game of Thrones star had just wrapped her Broadway stint in Breakfast at Tiffany's in late April (13) when she was admitted to hospital, according to the National Enquirer.

Sources tell the tabloid the 26 year old was treated at the New York Presbyterian/Weill Cornell Medical Center in Manhattan, but she has since bounced back from the alleged health crisis and is currently shooting the fantasy drama series on location in Croatia.

One insider tells the Enquirer, "Everyone was so scared for her. She's so young, and nobody would have ever expected that she could be suffering from something so serious...

"Emilia is doing really well now and she should be Ok moving forward. No one really knows what caused the aneurysm. It seems like a fluke thing."

A representative for Clarke had yet to respond to requests for a comment as Wenn went to press.