Vikings receiver Percy Harvin, a strong candidate for NFL offensive rookie of the year, missed an extended stretch of practice over the past two weeks and last Sunday's game against the Bengals due to a severe migraine headache.
But NBC's Andrea Kremer also points out that Harvin learned this week that he has two bulging disks in his neck. He'll be visiting the Mayo Clinic on Tuesday with a team doctor for further evaluation.
Making the news even more surprising is that there has been no whiff of Harvin having a neck problem on the official injury report.
As to the migraines, Harvin's most recent bout included loss of vision and vomiting. He also is concerned that some teammates might wonder whether the illness is genuine.
"Guys could see how blood shot my eyes were from crying and they saw me throwing up in meetings," Harvin said. "I think they know what was going on with me."
Still, with the Vikings getting ready for the playoffs and Harvin playing such a key role in the team's 2009 offensive upgrade, some players will resent Harvin if a migraine keeps him from participating in a postseason game that the team loses.