Mississippi State center Jarvis Varnado was in the hospital and undergoing tests after falling ill during a workout Monday.
Varnado felt nauseous and was first taken to a local hospital in Starkville before being moved to the Northeast Mississippi Regional Medical Center in Tupelo for tests.
Though the illness is not considered serious, spokesman Gregg Ellis said the school is taking "every precautionary measure" with the Southeastern Conference tournament MVP.
"He's fine," Mississippi State coach Rick Stansbury said in a statement. "We expect him back at full speed very shortly. We're just being very cautious."
Ellis said doctors are checking for everything from a bad diet to exhaustion.
Varnado is one of this year's premier returning seniors after two years as the nation's leading shot blocker.
The 6-foot-9 Brownsville, Tenn., native had 170 blocks last season and 327 in the last two. He needs 141 to tie the NCAA career mark. He also led the Bulldogs with 12.9 points and 8.8 rebounds per game.
He briefly entered his name in the NBA draft last spring before deciding to return to school. He also was a member of the U.S. team that finished third in the World University Games over the summer.