Concerns have been rising among close friends of Zac Efron, who have expressed worries about his recent erratic behavior.

Insider sources speculate that the former "High School Musical" star may be grappling with the pressures of being in the limelight once more.

Is Zac Efron OK?

An anonymous source divulging information to the National Enquirer notes a noticeable shift in his backstage demeanor. Instead of the vibrant sparkle that used to illuminate his eyes, they now appear empty and void of emotion.

He recently has been wearing sunglasses during morning TV appearances which many found odd. These actions have sparked fears that he may be susceptible to the same substance abuse problems that plagued him in the past.

A close friend voices concerns about his readiness to return to the harsh realm of celebrity, worrying about Zac's preparedness.

Following a tumultuous period in his life, Zac sought help for his battle with alcohol and cocaine addiction in 2013.

Reflecting on his journey, he candidly shared his triumph over adversity with The Hollywood Reporter.

In 2014, the actor-singer openly discussed his ongoing battle, expressing that it felt like an endless journey. He acknowledged the excessive consumption of alcohol, admitting that he had indulged in it excessively.

READ ALSO: Zac Efron Faces Criticism for Allegedly 'Disrespectful' Treatment of Kelly Clarkson on TV

He explained, "I had done films back-to-back-to-back. I was burnt out. There was something lacking, some sort of hole that I couldn't really fill up. I was just so deep into my work; it was really the only thing I had."

Despite the adversity he faced, Zac expressed no regrets about his choices, acknowledging, "When you're young, unattached, and navigating the complexities of Hollywood, it's an overwhelming whirlwind. Every opportunity and challenge comes rushing towards you. I wouldn't trade any of it; every lesson was necessary for my growth."

Crediting his remarkable transformation to Alcoholics Anonymous and therapy, the "Extremely Wicked, Shockingly Evil and Vile" star acknowledged the profound impact these support systems had on his journey to recovery.

In a candid interview, he revealed, "From the moment I embarked on this path, my life took an extraordinary turn."

Zac Efron's peculiar behavior has become a topic of intrigue.

The spotlight was particularly drawn to him during his appearance on "The Today Show," where he sported sunglasses to promote his latest venture, "The Iron Claw." This unexpected choice left numerous fans speculating whether he was concealing the aftermath of a botched cosmetic procedure.

He eventually said he was suffering from an eye infection.

READ MORE: Zac Efron Reflects: The Impact of Matthew Perry's Death and Shared Memories from '17 Again'

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