Actor Eric Dane, known for roles in Euphoria and Grey’s Anatomy, recently revealed his ALS diagnosis, sharing that he has lost full use of his right arm and hand. As his condition progresses, the announcement is sparking important conversations about the disease.

The "Euphoria" and "Grey's Anatomy" star, who revealed his diagnosis last Tuesday, sat down with "Good Morning America" to talk about his incurable condition.

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.