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Danica Patrick said she doesn't have a concussion from Sunday's hard crash at Phoenix, but she joked she might have one from Thursday night when a rock hit her in the head.

Dale Earnhardt Jr. says he passed a big test by racing in the Daytona 500 after a hard crash during the Nationwide race the day before.

NASCAR is on pace to make neurological baseline testing, used to determine if there is a loss of function after a head injury, a mandatory part of the preseason physical by 2014.

Tuesday's highlights from the NASCAR media tour in Charlotte, N.C., and beyond.

Dale Earnhardt Jr. is glad he made the decision to tell doctors about the headaches and other symptoms that forced him to miss the past two Chase races with concussions.

Dale Earnhardt Jr. isn't competing for the title after missing two races. But confronting concussion symptoms -- and being honest about it -- might be the most important thing to happen in NASCAR this year.

Mark Garrow previews Sunday's race at Martinsville for Stock Car Challenge.

Dale Earnhardt Jr. has been cleared to race this Sunday at Martinsville Speedway.

NASCAR team owner Rick Hendrick> held a midrace news conference at Kansas Speedway on Sunday to retract his previous statement that Dale Earnhardt Jr. was cleared to race next weekend at Martinsville, Va.

And we thought Talladega was the wild-card race in this Chase? Newly repaved and reconfigured Kansas Speedway is the great unknown. And that means it's dangerous.

Dale Earnhardt Jr.'s sister says NASCAR's most popular driver could be back racing next week at Martinsville Speedway.

Dale Earnhardt Jr. met with renowned concussion specialists at the University of Pittsburgh Medical Center's sports medicine concussion program Tuesday.

CHARLOTTE N.C. -- NASCAR is reviewing with its medical experts all aspects of how it deals with concussions, including baseline testing that the IndyCar Series and other contact sports use.

Dale Earnhardt Jr.'s difficult decision to sit out two races while recovering from concussion symptoms effectively takes him out of contention for the Chase, even though he's not yet officially eliminated by the Rule of 72.

The news surrounding Dale Earnhardt Jr.'s head injury raised a question that needs addressing: Do ailing drivers routinely risk their health -- and the health of others -- to stay behind the wheel?

Dale Earnhardt Jr. has a concussion and will sit out the next two Sprint Cup races at Charlotte and Kansas.