A brief summary of current research.
Balance deficits after sports-related concussion in individuals reporting post-traumatic headache
Register-Mihalik JK, Mihalik JP, Guskiewicz KM. Neurosurgery. 2008 Jul;63(1):76-80; discussion 80-2.
This study reports that people who persist with post-traumatic headache can have difficulties with balance in addition to the already recognized problems with thinking skills.