Tracy Morgan Hospitalized

The 30 Rock star had to cancel a pair of comedy shows in Colorado after he was taken to the hospital to be treated for flu-like symptoms

We're starting to become concerned for Tracy Morgan's health, at least when he's traveling to high altitudes. For the second time in five months, the 43-year-old 30 Rock star has been unexpectedly hospitalized.

Morgan, who caused a stir when he collapsed at the Sundance Film Festival in Utah in January, was set to perform at Denver's Comedy Works South on Saturday -- but instead was rushed to the hospital for dehydration and flu-like symptoms, TMZ reports. The comedian was treated for several hours before being released, and his two comedy shows for the night were canceled.

On Sunday morning, Morgan was photographed being pushed around Denver International Airport in a wheelchair before taking a flight back to New York City..

"He is fine," Morgan's rep told GossipCop. "He had the flu before he left [for the trip]."

A Denver editor for the Huffington Post was in attendance at the Denver show before it was canceled, and says many audience members thought Morgan's illness was a joke at first.

"The emcee came out and told us that Tracy was feeling sick and wasn't going to come on," editor Matt Ferner says. "The crowd thought it was a joke at first. But it quickly sank in how serious this was when the manager of Comedy Works South came out to tell us that Tracy was hoping to feel well enough to perform for the 10 p.m. show, but that there was no way they were going to let him because he was in such bad shape."

Full refunds are being given out to those who purchased tickets.

This isn't the first this sort of thing has happened to Morgan. While at an awards party at January's Sundance Film Festival, the actor gave off the appearance of being inebriated, running around yelling and then finally falling to the floor. He was rushed to the hospital soon after, and was said to have been sick from a combination of altitude and exhaustion. No drugs or alcohol were found in his system.

Morgan also was hospitalized in late 2010 when he underwent a kidney transplant. The Saturday Night Live alum suffers from diabetes.