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According to the comics, the Hulk has very fast regeneration abilities similar to Deadpool.

At the end of Avengers: Endgame, the Hulk has his charred right arm in a cast because of the burns from using the Infinity Gauntlet to "unsnap" everyone who died at the end of Avengers: Infinity War.

Why hasn't it regenerated back yet, or even partially regenerated?

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    Presumably because of his finding a "third way" between brains and brawn. He's obviously dialled down his hulk powers. – Valorum Apr 29 at 17:57
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    There’s a theory, currently being studied by the finest minds of our generation, which posits that comics and movies are actually different. – Paul D. Waite Apr 29 at 19:09
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    Like @Valorum states, it seems safe to assume that if Bruce were to "Hulk out" and go fully savage Hulk then it's possible he could regenerate the arm. It seems possible that in this halfway state, his Hulk powers are not as intense. – Zip Zap J Apr 29 at 19:36
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    @Kyza I've added an answer below which quotes Joe Russo and is different to the accepted answer's speculation if you want to have a look. – TheLethalCarrot May 9 at 15:04
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Because that's not an ability that they've covered in the MCU. In the movies so far they've had The Hulk be basically invulnerable, in fact getting stronger as he soaks up hits in his standalone films, we haven't seen him do any healing at all on screen let alone at an accelerated rate. I understand that Endgame is already a long movie, ten more minutes run time to explain that The Hulk can regenerate, and oh that's always been a thing we just hadn't noticed was probably not a good idea.

Alternately the fact that the damage was done by the Infinity Stones may mean that he simply can't regenerate.

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    "I understand that Endgame is already a long movie, ten more minutes run time to explain that The Hulk can regenerate, and oh that's always been a thing we just hadn't noticed was probably not a good idea." The length isn't really relevant; randomly introducing a previously unheard of power - several movies after the character has been introduced - feels incredibly cheap to most viewers. Introducing Nebula's network to allow 2014-Thanos to know about the 2023-Avengers plans was bad enough. – Anthony Grist Apr 29 at 20:13
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    “they've had The Hulk be basically invulnerable, in fact getting stronger as he soaks up hits in his standalone films” — he gets knocked out in Age of Ultron (by the Hulkbuster armour) and Infinity War (by Thanos), and is almost beaten by Thor in Ragnarok. He also seems to suffer against the Chitauri weapons in Avengers, and gets bitten by Fenris in Ragnarok. He’s not portrayed as invulnerable. – Paul D. Waite Apr 29 at 23:21
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    Banner also effectively commits suicide on Asgard and The Hulk emerges and he and Banner are both fine. So they have, in fact, made it quite clear that The Hulk can repair damage quickly. – zibadawa timmy Apr 30 at 2:27
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    @PaulD.Waite Did I say I was talking about Mark Ruffalo's Hulk? No I did not, I said Hulk's "standalone films" which none of those are. – Ash Apr 30 at 12:45
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    @Ash: yup, Hulk (2003) is not part of the Marvel Cinematic Universe. – Paul D. Waite Apr 30 at 15:05
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Because the damage was caused by the Infinity Gauntlet

Joe Russo has confirmed that the damage is "permanent" and compares it to the damage Thanos receives from using the Infinity Gauntlet. As such it is safe to assume the reason is because the damage came from the Infinity Gauntlet and so the Infinity Stones. The amount of power needed to unsnap, and in Thanos' case snap, is what caused such irreversible damage.

“He’s lost an arm,” Russo says. “He lost Natasha. That’s not coming back. He’s damaged himself. I don’t know. It’s interesting. That’s permanent damage, the same way that it was permanent damage with Thanos. It’s irreversible damage. His arm, if you noticed, is a lot skinnier. It’s blackened. So, he loses a lot of strength there.”

Russo does acknowledge that “permanent” means something different a world of magic and super science, but that’s not his concern any longer.

“But who knows? There’s a lot of smart people left,” he says. “Maybe someone helps him repair that. Maybe someone gives him a new arm. I have no idea where that character goes from here. The nice thing is we didn’t have to pay attention to where it goes after this, we just try to tell a satisfying ending.”

Comicbook, Avengers: Endgame Director Reveals Hulk's Injury Is Permanent

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In the comics Professor Hulk has the benefit of Banner's brain but is no where near as strong as primitive Hulk. In fact when Professor Hulk gets to angry he reverts to “puny Banner” with Hulk's primitive mind.

Therefore this delay in healing does follow the comic book lore.

In addition this is an Infinity Gauntlet. Banner already states that it gives off tremendous radiation that will hurt him.

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    im not sure if I misheard but I believe Hulk says - "it's mostly gamma radiation, I should be fine" and "....I was made for this". He never mentions that it will hurt him – Karan Shishoo Apr 30 at 6:42
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    Sorry your right I re watched it since posting this. He does say it’s gamma radiation, but his “I should be fine” is not very definitive. Plus saying I should be fine could mean, I won’t die like you all will, as opposed to it won’t hurt me at all. – Richard C Apr 30 at 8:23
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  1. MCU Hulk does not show deadpool levels of regeneration. While he does have regenerative capabilities they are nowhere as fast.
  2. There's a very significant amount of damage that was inflicted. For reference:

    Using the gauntlet straight up killed Tony. Hulk survived with merely a burnt arm.

That is already a huge testimony to his regenerative powers!

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    Also Tony only wished away Thanos army, Hulk has to wish back everything that was taken away and undo all the damage done to the planets remove all overgrown vegetation etc. that isn’t a lot more demanding then getting rid of half the universe. – Richard C Apr 30 at 8:25
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    True. Not sure if the "wish" affects how much damage the user takes, but even if it did, Tony got destroyed for a lot less than the Hulk had. That further goes on to show how much he can regenerate. – Stark07 Apr 30 at 8:27
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Banner said in the The Avengers he shot himself in the head and Hulk spat the round out... seems like pretty good/quick healing to me so they just messed up.

Banner: In case you needed to kill me, but you can't! I know! I tried! I got low. I didn't see an end, so I put a bullet in my mouth and the other guy spit it out!

The Avengers

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    To me that line never implied any sort of healing or regeneration, only that he involuntarily transformed into the Hulk the instant the bullet hit. – Kyle Doyle May 13 at 16:09
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During the secret war ark, they had Banner Hulk - which is effectively Bruce Banners brain in Hulks body. Something we seem to be seeing in endgame. Professor Hulk is a combination of Savage hulks strength, Banners mind, and Grey Hulks cunning. Not the same thing. On top of this, Prof Hulk is actually consider the strongest hulk at a baseline level (disregarding the madder/stronger factor, which savage Hulk can utilize to his advantage due to being... well, savage). Or was, up until World war hulk, which seems to be simply the grey/savage combined.

Its all very confusing, but there are many Hulk's running around in the comics.One cannot simply assume something for the film; based on what they understand from the comics, because its not the same thing. Hulk heals because Prof Hulk has regenerated 90% of his body mass in comics doesn't quite work, because we don't even know what Hulk this is, let alone what his capabilities are. That being said, hopefully the arm Heals, and Hulk gets some actual fight time his next go around.

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    I'm not entirely sure given some of the wording here if you've written this as an answer to the question or as a reply to this answer. You do have some good information here though so could you edit it to focus more on being a direct answer to the question if this was intended to be a reply to another answer? – TheLethalCarrot May 1 at 14:36

protected by Machavity May 9 at 14:51

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