Former Grey’s Anatomy star Eric Dane revealed that he had to miss a planned appearance at the Emmy Awards because of a head injury tied to his ALS diagnosis.

Dane was set to present an Emmy alongside his old Grey’s co-star Jesse Williams, but had to pull out at the last minute. (Williams presented the award alone.) Speaking with The Washington Post , Dane said, “ALS is a nasty disease… So I was in the hospital during the Emmys getting stitches put in my head.”

The actor, who revealed his ALS diagnosis earlier this year, declined to say exactly what caused the injury. ALS — also known as Lou Gherig’s disease for the baseball star who was diagnosed with it — is a degenerative disease that affects nerve cells in the brain and spinal cord, and can cause loss of muscle control.

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