“Game of Thrones” actress Emilia Clarke disclosed Thursday that she’s had two surgeries for brain aneurysms.

In 2011, she developed a sudden, severe headache while working out and was rushed to a hospital. Doctors discovered two brain aneurysms, which occur when a blood vessel in the brain has a weak spot that causes it to bulge and fill with blood, ABC News reported.

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Aneurysms can burst and be life-threatening, because they cause bleeding in the brain.

Doctors found that one of Clarke’s aneurysms had burst open, but were able to treat it with minimally invasive surgery. In 2013, routine monitoring showed that the second aneurysm had doubled in size.

During minimally invasive surgery to repair it, that aneurysm burst, forcing doctors to perform open-brain surgery on Clarke, ABC News reported.

“In my years since my second surgery I have healed beyond my most unreasonable hopes,” said Clarke, who plays Daenerys Targaryen on ‘Game of Thrones,’ a wildly popular fantasy series on HBO.

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