Rapper Dr. Dre has been hospitalized after suffering a brain aneurysm, TMZ reported Tuesday. The music mogul, whose real name is Andre Young, is being treated at the intensive care unit at Cedars Sinai Medical Center in Los Angeles, the site reported.

Dre is reportedly lucid and in stable condition, but doctors are trying to determine the cause of the bleeding.

In addition to being a record producer and audio engineer, the 55-year-old Dre is also a co-founder of headphone maker Beats. Dre founded the company in 2006 with Jimmy Iovine. Apple acquired the company in 2014 for $3 billion.

Aneurysms occur when an artery wall becomes weak, causing the blood vessel wall to balloon and sometimes bleeding into the surrounding area. The causes aren’t always clear, but common causes include high blood pressure and atherosclerosis, the collection of fats and cholesterol on the artery walls.

Neither Apple nor Cedars Sinai immediately responded to a request for comment.