Danica estimates dozen concussions in racing career

File photo: Feb 22, 2015; Daytona Beach, FL, USA; NASCAR Sprint Cup Series driver Danica Patrick (10) during driver introductions before the Daytona 500 at Daytona International Speedway. Andrew Weber-USA TODAY Sports

(The Sports Xchange) - Danica Patrick estimates she suffered at least a dozen concussions during her racing career and told reporters Wednesday she would retire from NASCAR if a doctor told her there would be long-term risks from another head injury.

The subject of concussions came up during Daytona 500 media day at Daytona International Speedway after Dale Earnhardt Jr. missed half a season last year to battle the symptoms.