Actor Josh Hartnett has been discharged from Los Angeles' Cedars-Sinai Medical Center, five days after he was admitted suffering a gastrointestinal disorder.

The 30 Days of Night star checked into the hospital on Sunday after a "flare-up" of an ongoing stomach problem that first affected him when he was performing on London's West End stage last year.

Hartnett's publicist reveals the actor has undergone tests all week - but doctors have yet to properly diagnose his condition.

Susan Patricola tells Usmagazine.com. "He has had a lot of testing. They released him, and they are trying to figure out what it might be. He is fine."

Josh Hartnett Photos

(This news article provided by World Entertainment News Network)