"Alex did some baseball activity today and felt a little bit lightheaded," manager Brad Ausmus said on Tuesday afternoon, "so he's going to be off, and continue to be day to day until we get through a day where he does activity and doesn't have any side effects."
The Tigers were hoping that Sunday's episode was isolated and wanted to ramp up his activity and see how he felt to make sure. The return of the symptoms has to be a worrisome development after Avila missed three games with concussion symptoms earlier this month.
At the time, Ausmus said, Avila did not show the typical signs.
Jason Beck is a reporter for MLB.com. Read Beck's Blog and follow him on Twitter @beckjason. This story was not subject to the approval of Major League Baseball or its clubs.