It is estimated that the prevalence of LCHI (lifetime concussion head injuries) ranged from 3.6% to 7.0% for children ages 3–17 years and from 6.5% to 18.3% for adolescents 13–17 years. Concussions are the most common form of head injuries that children and adolescents get. And over 50% of concussions are due to sports. Learn more about the symptoms and long-term problems that can come from having even a "mild concussion."