Vonn spokesman Lewis Kay said in an email the Olympic gold medalist was in a hospital in Vail awaiting results from "diagnostic testing for severe intestinal pain," The Denver Post reported.
"We will send an update on her condition when more information becomes available, Kay said.
Vonn, 28, is the reigning World Cup overall champion.
Ray Liotta sues skin care company over use of likeness
NBC reportedly holds celebs hostage to Jimmy Fallon's show