During the conversation, Luddington explained about the disease, stating that Hashimoto happens when the body's immune system accidentally attacks the thyroid, making one a little ...

Spoiler alert! This story discusses spoilers from Grey’s Anatomy’s Season 21 finale, so if you’re not caught up, stream the episode with a Netflix subscription or Hulu subscription before continuing.

The 18-episode Grey's Anatomy Season 22 returns on Thursday, October 9. Stay tuned to Collider for more updates.