A concussion is a traumatic brain injury that can cause lasting effects on brain tissue and change the chemical balance of the brain. Concussion may cause physical, cognitive, and behavioral symptoms and problems, both short-term and long-term. The Centers for Disease Control (CDC) estimates that 1.6 million to 3.8 million people experience concussions during sports and recreational activities annually in the United States. These numbers may be underestimated, as many cases are likely never reported. A physical therapist can assess symptoms to determine if a concussion is present, and treat your injury by guiding you through a safe and personalized recovery program.