Why does Bane wear a mask?

Answer 1

In the comic books Bane wears his mask as a constant introduction of a very strong steroid called venom that keeps him strong.

However, Chris Nolan doesn't follow the comic book lore. In the movie "The Dark Knight Rises", when Bane saves the girl from the attackers in the jail, the attackers beat Bane to near death. The attack left Bane's spine and back broken. Doctors had to perform cervical fusion throughout his entire spine (hence the long scar seen on Bane's back when you first see him in the sewers). The surgery was successful however he was left him in crippling pain. The mask was made to constantly introduce an anesthetic into his blood/lungs so the pain would go away. When Batman breaks one if his pipes from his mask, some of the painkiller is released and the pain inches back, slowly crippling him. This is also why Bane went berserk on Batman in an effort to finish him off before the pain increased.

Answer 2

In the Batman mythos, Bane's mask has tubes that connect to his brain. A drug called Venom is pumped into him, giving him significant physical strength. In The Dark Knight Rises, Bane's mask pumps in gas that eases his pain from injuries he sustained in Talia al Ghul's escape from the Pit.

Answer 3

In Batman: The Dark Knight Rises, Bane needed the mask to live for some reason.

Answer 4

Tom Hardy