The US comedian will undergo surgery to have part of one of her lungs removed, but insisted she should be "just fine".
Stars like Whoopi Goldberg, Julia Louis-Dreyfus, Chrissy Teigen and Trevor Noah have shared their thoughts.
Lady Gaga, Cardi B and Cher were also among the stars celebrating Joe Biden's victory over Donald Trump.
The comedian faced similar backlash in 2017 for posing with a fake severed head that bore a resemblance to the US president.
The comedian suggested she was being denied a Covid-19 test and called out Donald Trump for "lying".
"This video isn’t a joke to his followers. And it will not be taken as such," she wrote of an animated clip that shows Donald Trump murdering media outlets and critics.
The comedian threw down a profane challenge after the complaint was dismissed.
The comedian attacked the U.S. first lady’s statement on separating families at the border.
Roseanne's co-stars have also added their voices to the discussion.
"He's a big liar and everybody should get rid of him soon."