Los Angeles, California - In a new interview with Diane Sawyer, Matthew Perry revealed the recent surgery he underwent just days before the filming of HBO Max's Friends reunion in 2021.

The 53-year-old's appearance in the special raised concerns among fans, noting that his speech was slurred at several points in the reunion.

Perry explained in the interview that he had actually undergone "emergency dental surgery" just days before the special, which caused the issues with his voice.

The procedure was painful for Perry as he recalled feeling as though his mouth was "on fire."

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He didn't want to miss the highly-anticipated special, despite the obvious impact of the surgery.

"So what I chose to do was just go and do the best that I could," Perry said.

While promoting his upcoming memoir, the Fools Rush In star has revealed new details about his addiction. He admitted that he nearly died in 2018 due to health issues stemming from opioid overuse.

Perry also has shared insight into how his addiction battle affected his time on Friends. Speaking with People magazine, he shared that all of his costars were "understanding" and "patient" about his addiction.

In his interview with Sawyer, the Friends star revealed that Jennifer Aniston was the costar who reached out to him the most about his addiction battle.

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When Sawyer showed scenes from the TV show in which his addiction was at its worst, Perry became visibly upset, saying that he felt sorry for the person he was at that point.

He hopes that by sharing his story honestly through his memoir, he'll be able to help people who are struggling as he did.

Perry's memoir, Friends, Lovers, and the Big Terrible Thing, hits bookstores on November 1.