It is not explained.
As far as I know, it doesn't happen in the original comics. In the movie, it just eventually happens, seemingly without a specific cause.
The group discloses that they are not actually immortal: their power to heal eventually stops without warning.
Pictures about "What made Andy lose her immortality?"
Does Andy lose her immortality?
The ending of The Old Guard, however, put several things in stark perspective for Andy, Nick, Joe, Nile, and Booker from the reveal that Andy is no longer immortal
to the twist that her partner, Quynh is alive.
Why did Andy lose immortality?
This was in the original comic book too, but the big change Rucka made in the movie was to have Andy lose her immortality. Andy realises that she's lost her immortality when a stab wound from an earlier fight doesn't heal
Does Andy gain her immortality back?
Someday, without warning, they won't get back up again
. And over the course of The Old Guard on Netflix, Andy realizes that she's no longer healing from her wounds. The revival she underwent in The Old Guard's first fight scene was her last, and the next time it'll be permanent.
How did Quynh survive The Old Guard?
Plot. At the end of The Old Guard, Booker drunkenly stumbles into his apartment after Andy, Nicky, Joe, and Nile sentence him to 100 years of exile from the group. He finds a woman in his apartment drinking a glass of water
, revealing Qu\u1ef3nh to be alive.
The Old Guard smartly changed Andy's immortality from the comics [News]