I did not hit my head in the accident, why does my doctor think I might have some kind of traumatic brain injury.Traumatic brain injury does not necessarily have to arise from a direct blow to the skull, nor does it have to arise from a loss of consciousness.
Brain injury can occur when the soft material of the brain is impacted against the hard structure of the skull. An example of this is understood when considering the shaking of an egg. If you shake an egg, even though it does not drop to the floor, you're actually causing the inner portions of the egg to slam against the hard shell, and thereby potentially cause damage to the inner yolk of the egg.
When involved in an acceleration/deceleration accident, rear-end collision, or violent impact of some sort, even with a helmet on, as in the case of a motorcycle rider, the soft brain material can be forced violently against the hard outside shell of the skull, causing microscopic or overt brain injury.
Overt brain injury is seen by bleeding or hematoma on scans, while microscopic injury is hard to see and hard to diagnose.
If you think you have been subjected to injury to the brain, you should consult a medical professional that specializes in this area of injury to help you through the difficulties this injury causes.