Vikings WR Percy Harvin has had migraines cause problems for him since he entered the NFL. Last year it caused him to miss one game and during training camp this year he missed several weeks with what was partially attributed to migraines.
It sounds like the migraines are back as Brad Childress told reporters Harvin missed practice due to another migraine.
It's not the only injury he's working with -- he also has a hip strain that made his status for Sunday questionable.
Check out Daily Norseman to more on Percy Harvin's migraines.