Hanson was diagnosed with a Grade 1 concussion, which ranks as the lowest on the scale. The 25-year-old pitcher will be evaluated again after he has a chance to rest for 48 hours. He will gradually progress toward normal activity once he is no longer showing any concussion symptoms.
As long as Hanson does not suffer any setbacks, he could begin participating in workouts again by this weekend or early next week. Braves manager Fredi Gonzalez does not believe this will put the 25-year-old pitcher behind schedule.
"If everything progresses like we think it will, he'll be fine," Gonzalez said. "The thing [our trainers] do not want to do is bring him back too early, and then he gets dizzy because of the concussion. It's just a natural progression."
Hanson was excited to get his Spring Training workouts started after missing the final two months of the 2011 season because of his previously ailing right shoulder. He threw off the mound multiple times over the past month while altering his delivery in an attempt to lessen the strain on his shoulder.
Gonzalez said Hanson does not remember whether he hit his head after he blew a tire and went off the road while traveling to the Braves' Spring Training complex around 7 a.m. ET on Monday.
Hanson arrived at the complex a short time later and was prepared to participate in Monday's workout before informing Atlanta's medical staff that he did not feel right. He was then sent to an area doctor who diagnosed the mild concussion.