Nick Cannon hospitalized with pneumonia a day after his sold-out Madison Square Garden show: 'Life is definitely a rollercoaster'

• Nick Cannon has been hospitalized with pneumonia after performing at Madison Square Garden in NYC.
• The comedian, who also has lupus, told his fans on Instagram he isn't "Superman."

Nick Cannon has told fans he is "not Superman" and has been hospitalized with pneumonia after performing to a sold-out crowd at Madison Square Garden in New York City on Friday.

The comedian, 42, gave his Instagram followers an update on his health in a post he shared Saturday that has over 328,000 likes. In the series of selfies, Cannon appears lying on a hospital bed with a face mask on.

Captioning the post, the father of 12 said he had "promised" himself he would never be "back at this place again."

"It's just pneumonia, nothing I can't handle," Cannon wrote. "Crazy thing is, last night we was just rocking a sold out crowd at Madison square garden in front of thousands of fans, now I'm all alone in a tiny hospital room. Life is definitely a rollercoaster!"

"Don't trip though, I don't need any well wishes or prayers, just some solid rest, and I will be back on the journey to becoming stronger than ever," he wrote. He also called the experience a "great lesson" in taking care of oneself.

Cannon included the hashtag #LupusWarrior at the end of the caption, a reference to the autoimmune disease he was diagnosed with in 2012. According to his bio on the Lupus Foundation of America website, he was diagnosed with lupus-kidney disease, also known as lupus nephritis, after experiencing fatigue and swelling of the knees.

In a 2014 filmed interview with the Lupus Foundation of America, Cannon opened up about how he has learned to live with lupus, a disease that also garnered attention after Selena Gomez went public about her own lupus diagnosis in 2016.

"I have lupus, but lupus doesn't have me," he said. "It's made me stronger. I'm definitely in better shape, better health than I've ever been before because it's allowed me to pay attention and focus more on my health."