The star fell ill while promoting his new film Predisposed at the Park City, Utah event.
Morgan's rep later said his hospitalisation was caused by a combination of exhaustion and altitude sickness, while the actor himself jokingly tweeted that "Superman ran into a little kryptonite".
The star has since flown home to New York City and has begun filming 30 Rock once again.
Morgan's spokesperson told The AP: "He appreciates everyone's support and concern."
The comedian became embroiled in controversy in 2011 when he engaged in an anti-gay rant during a Nashville, TN stand-up show.
Morgan has since apologised for his comments and insisted that his first priority is always to "heal the world, not to hurt anyone".
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