Fans tuning into "The Kardashians" got a shocking health update on Thursday, Oct. 23, as Kim Kardashian revealed she was diagnosed with a small brain aneurysm.

Kardashian announced her medical update in a preview clip that aired during the Season 7 premiere of Hulu's "The Kardashians" on Oct. 23. While most brain aneurysms are small and without symptoms, a rupture can prove deadly.

Here's a closer look at the health condition – from the Detroit Free Press, which is a part of the USA TODAY Network – and what this means for the star.

Kim Kardashian was diagnosed with a small brain aneurysm, she said in a preview clip during the Oct. 23 Season 7 premiere of Hulu's reality TV series "The Kardashians."

A brain aneurysm is a bulge or weak spot in a blood vessel, typically in or around the brain, the Cleveland Clinic says. While most are small, a ruptured brain aneurysm can be life-threatening.