ALS disease explained as Grey’s Anatomy star Eric Dane opens up about the very first symptom he experienced before receiving his shock diagnosis in April.

Eric Dane, an actor best known for playing Dr. Mark Sloan, aka "McSteamy," on "Grey's Anatomy," discussed his health challenges after being diagnosed with ALS.

He emphasized his perseverance moving forward, saying, “I’m fighting as much as I can,” though he admitted, “There’s so much about it that is out of my control.”