Jeremy Renner has been showing off his remarkable recovery from his New Year's Day snowplow accident in recent interviews and a red carpet appearance for his new show, "Rennervations."

While he's been putting on a brave face for the public, behind the scenes he's been in "excruciating pain," according to Christopher Vincent, a chiropractic sports physician and trainer who is part of the team aiding Renner as he heals from his numerous injuries.

"I mean, it's bad enough with one of those traumas," Vincent said in an interview with People. "The fracture through his tibia was so severe that that alone... mentally you can't deal with that much pain."

"When you've got 30 of those, your body is just sending pain signals to your brain from every part of your body. You can't override them," Vincent continued. 

JEREMY RENNER WALKS FIRST RED CARPET WITH DAUGHTER'S SUPPORT AFTER NEARLY DYING IN SNOWPLOW ACCIDENT

Jeremy Renner smiles at the premiere of his Disney+ show "Rennervations."

Jeremy Renner is healing remarkably well after nearly dying in a snowplow accident. (Gilbert Flores)

"You're mentally just trying to quiet them down. It's happening 24 hours a day, so it's not like he gets a reprieve when he's sleeping. It doesn't sleep, so it's affecting your sleep, and that lack of sleep is affecting your recovery."

The tibia fracture he mentioned was one that doctors also discussed as part of Renner's interview with Diane Sawyer – the bone broke in multiple places and a titanium rod had to be inserted for it to heal properly.

Besides that, he said he's broken "35 or so bones," and that one of his lungs collapsed after his chest was crushed by the 7-ton snowplow. His liver was punctured, but he said that "wasn't dangerous," and his eye popped out of its socket, which has obviously been repaired.

Jeremy Renner posts from hospital after accident wearing dark rimmed glasses, a breathing tube in his nose and hospital gown with bruises on his face

Jeremy Renner suffered significant injuries due to his New Year's Day accident in Reno, Nevada. (Jeremy Renner/ Instagram)

The physician said that while he began his recovery, Renner focused on "meditating and just trying to calm himself to override this.... As he's in bed, we're moving his shoulders, moving his hips, moving his limbs. Just trying to fire off some of those signals and keep the joints from freezing up, keep him moving."

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The team has also suggested a noninflammatory diet for him, as well as supplements that may help reduce "pain signals getting to his brain."

Vincent is the person responsible for getting the antigravity treadmill that Renner showed off on social media, and as time has gone on, he's brought in enough equipment to turn Renner's home into "a full rehab center."

Jeremy Renner physical therapy includes treadmill

Jeremy Renner uses unique treadmill to strengthen his legs. (Jeremy Renner/Twitter)

"He's an extremely unique and rare person," he said of the Marvel actor. "I've worked with hundreds and thousands of athletes, celebrities, regular people, and it's really a special personality that has that drive and determination."

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He added that he's positive the star will "get through it to where you are back stronger than you were before the accident."

Jeremy Renner muscle pain

Jeremy Renner has been updating his fans on his recovery on social media. (Jeremy Renner Instagram)

Jeremy Renner holding hands with his daughter

Jeremy Renner made his first red carpet appearance after his snowplow accident for the premiere of his show "Rennervations." His daughter Ava Berlin Renner was there to support her dad as he walked with a cane. (Matt Winkelmeyer/GA/The Hollywood Reporter via Getty Images)

Renner's best friend and "Rennervations" costar Rory Millikin also gave a statement to People, saying, "He's a very passionate person. His mood is great. It's strengthened by family and friends, who have been wonderful."

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"You hear this, it sounds cheesy, thanks for all the support from fans, but it actually had a huge impact on him. He was reading through them all, and he actually spent the time reading a lot of these things and it gave him a lot of strength."