Singer Lady Gaga canceled a scheduled performance in Montreal, Quebec, just hours before taking the stage, citing a worsening respiratory illness, as reported by Fox News.

The cancellation was announced on Monday, when the “Poker Face” artist informed fans through her Instagram Stories that she would not be able to perform at the Bell Centre.

Gaga said the decision followed medical advice after her condition declined in recent days.

"I’m so sorry to share that I’m unable to perform tonight and have to cancel the show," she wrote. "I've been fighting a respiratory infection for the past few days and doing everything I can to rest and recover, but it’s gotten worse."

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Gaga explained that her doctor advised against performing and that she did not believe she could deliver the level of performance expected by her audience.

"My doctor has strongly advised me not to perform today, and to be honest, I don’t think I could give you the quality of a performance today that you deserve," she continued.

The singer also addressed fans who had planned to attend the show, acknowledging the disappointment caused by the sudden cancellation.

"I know how deeply disappointing this is, and I truly could not feel worse about letting you down," Gaga said. "I’m so sorry to everyone who made plans to be there and support me. Being in Montreal and performing for you on Thursday and Friday was magical and deeply meaningful. To everyone who was coming tonight, I’m absolutely heartbroken and so sorry."

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The canceled performance was part of Gaga’s ongoing “Mayhem Ball Tour,” which began in July. The tour has drawn large crowds and features a live vocal performance each night.

This is not the first time Gaga has canceled a show shortly before taking the stage. In September, she called off a performance in Miami due to concerns about her vocal health.

Ahead of that show, which was scheduled at the Kaseya Center, Gaga told fans that both her doctor and vocal coach advised her not to perform after she experienced vocal strain during rehearsal and warmups.

"Hi everyone, I am really so so sorry, but I need to postpone tonight’s show in Miami," she wrote in an Instagram Story at the time. "During rehearsal last night and my vocal warmup tonight my voice was extremely strained and both my [doctor] and vocal coach have advised me not to go on because of the risk it poses."

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She said she considered performing despite the issue, but ultimately chose not to risk long-term damage.

"I want to be hardcore and just push through this for you, but I don’t want to risk long-term or permanent damage on my vocal cords," Gaga explained.

"There is a significant risk based on all our combined experience with a show like ours, and as you know, I sing live every night — and even though this was a hard and agonizing decision, I would be more afraid of the long-term implications on my voice. I hope you can forgive me and accept my sincerest apologies for any disappointment. Let down. Inconvenience."

Gaga concluded that message by noting efforts to reschedule.

"I tried so hard to avoid this," she said.

"I take serious care of myself to be able to put on this highly demanding show. I love my fans so much. Respect you and hope you can accept my sincere regretful apology. We are trying to reschedule the show as quickly as possible."