Following consultations with multiple Australian doctors, Whibley was deemed too unwell to perform.

In a statement, the band expressed deep sadness and regret over the cancellation, emphasizing their excitement to connect with Australian fans.

Whibley has been receiving local medical care and has kept fans updated on his condition, expressing gratitude for their support.

He has a history of health issues, including a severe incident in 2014 when he collapsed due to liver and kidney failure.

Earlier in 2024, Sum 41 announced their breakup after 27 years, with their final album 'Heaven :x: Hell' released in March 2024.

The band is set to be inducted into the Canadian Music Hall of Fame on March 30, 2025, during the Juno Awards ceremony.

Despite the cancellation, the Good Things Festival will still take place in Brisbane, Melbourne, and Sydney with a revised lineup.

Festival organizers have acknowledged the disappointment of fans but prioritized Whibley's health, wishing him a speedy recovery.

The festival will still feature performances from other artists, including Korn, Violent Femmes, and Billy Corgan.

Sum 41 has canceled their scheduled Australian tour for December 2024 due to lead singer Deryck Whibley's pneumonia diagnosis.

The band was set to perform at various venues, including a co-headline slot at the Good Things Festival.

Whibley was previously hospitalized for pneumonia in September 2023, which raised concerns about his health.