Dane -- who shot to fame amid six seasons on the hit ABC drama "Grey's Anatomy," where he played Dr. Mark Sloan, affectionately known as "McSteamy" -- said his symptoms began over one year ago, when he began to experience weakness in his right hand.

The San Francisco-born star of ‘Grey’s Anatomy’ and ‘Euphoria’ has been on Good Morning America this week to discuss the frightening realities of amyotrophic lateral

Eric Dane told Good Morning America’s host, Diane Sawyer, about the experience he had before his diagnosis. He said he was experiencing weakness in his right hand, but credited it to being tired. Also,

ALS, short for amyotrophic lateral sclerosis, is a degenerative neurological disorder that eventually leads to paralysis, taking away a person's ability to move, speak, swallow or even breathe, according to the National Institutes of Health.

Eric Dane, best known for his work on “Grey’s Anatomy,” opened up about his amyotrophic lateral sclerosis (ALS) diagnosis while on “Good Morning America” on Monday morning.

Actor Eric Dane teared up over living with amyotrophic lateral sclerosis (ALS) in his first interview after diagnosis.