A little bit of dizziness after hitting the head may be caused by concussion, neck injury and other reasons. 1. Concussion: concussion belongs to patients with light brain injury, and there is no organic change, usually due to the impact on the head, due to the intracranial brain cells and brain tissues are subjected to a relatively strong shock, resulting in transient brain damage caused by the brain function, which may cause a little dizziness, but also may be accompanied by lethargy or somnolence and other manifestations. 2. Neck injury: after hitting the head, the conduction effect of external forces, is likely to lead to changes in the position of the cervical spine or damage, easily caused by the cervical nerve compression, which may cause a little dizziness, may be accompanied by numbness of the limbs, weakness and other manifestations. Hit the head a little dizziness, it is recommended to seek medical attention as soon as possible, through the improvement of the relevant examination, to exclude organic lesions, if necessary, need to be guided by the doctor, targeted treatment.