Joel's medical condition in the HBO show is actually canon thanks to The Last of Us Part 1 Remake

The Last of Us game addresses the issue from episode 6 in a very subtle way

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Last of Us' Episode 6 Makes an Overlooked Game Easter Egg Into Canon

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The Last of Us' changed Bill and Frank's story, here's why

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What the fuck does that mean? The first game Ending is not

The Last of Us HBO Episode 6: What Is Wrong With Joel, Is He Sick

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The Last of Us' Remake Ending Will Probably Be More Controversial

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The Last of Us Game's Original Joel Actor Says Fans Will Hate His