My daughter got a concussion in a car wreck but did not hit her head. She was thrown hard into her shoulder seat belt. It was a violent stop. She cracked some ribs and her sternum.

Her Toyota pickup was totaled. The impact bent the frame. But, she never hit her head. She struggled with concussion symptoms for 3 months.

A car that stops suddenly in a collision can suffer a concussion. That stop will also trigger the air bags to go off.

A car that stops suddenly with braking will not caused enough deceleration to cause a concussion.

Those who make claims of a concussion without hitting their head in a car that has not hit something are confusing their symptoms. Emotional trauma can trigger many symptoms that mimic a concussion. Those symptoms may be real but they do not indicate brain damage.