What's wrong with Joel's heart on The Last of Us series?

In The Last of Us episode 6, "Kin," Joel keeps having dizzy spells and his heart feels like it's stopping. What's causing these symptoms? Info here.

The Last of Us recap episode three – absolutely magical television, Television

Does Joel die in The Last of Us game? Here's what happens to him and Ellie - PopBuzz

The Last of Us' Series-Premiere Recap, Episode 1

How HBO's The Last of Us pulled off the Sarah shocker

The Last of Us': Troy Baker on James, David and Playing Joel in Game

The Last of Us' Season 1, Episode 8 Recap: There But for the Grace - The New York Times

The Last of Us': Who Is Tommy? How Tommy Differs in the Game

The Ending of “The Last of Us” Is Supposed to Be Uncomfortable

The Last of Us' Season 1 Finale Ending Explained: Why Did Joel Lie to Ellie?

Joel Miller, The Last of Us Wiki

The Last of Us Part I : A Brutal Masterpiece is Reborn for the PlayStation 5

The Last Of Us Episode 9 Recap: A Powerful, Haunting Finale

David, The Last of Us Wiki