It was first reported by TMZ that Lee had been admitted at Cedars-Sinai with an irregular heartbeat and shortness of breath.
However, Lee, 95, has returned home and said he is "feeling good" now.
"I'm glad I spent that evening in the hospital," he told KABC news.
"It did me a lot of good. It probably did my fans a lot of good. It kept me off their backs for the evening. But I'm feeling good now and I can't wait to get in there and tangle with all the competition," he added.
Among Lee's most memorable creations are Iron Man, Thor, Black Panther, the X-Men, Fantastic Four and Spider-Man.
These heroes have become the backbone of both the Marvel Cinematic Universe, as well as, the Fox Marvel Universe, further proving that Lee's works are timeless classics.