Headache is the most common symptom of concussion. Brain Injury Awareness Month is coming in March, an effort to increase awareness of brain injuries and their significance. The Brain Injury Association of America recently updated their definition of traumatic brain injury: TBI is defined as an alteration in brain function, or other evidence of brain pathology, caused by an external force. Even seemingly mild jolts to the brain can actually cause a concussion. Ever get that feeling of being dazed? That’s a concussion, too. Headaches can occur immediately at the time of impact or in the ensuing days afterwards, and can be brief, or can result in prolonged and chronic problems.