It’s the time of year when you want to be outside enjoying your favorite summertime activities. For most of us, this means doing things that require us to be physically active. While this is great for your health, it can put you at an increased risk for an injury, particularly a head injury. How do you know if you have a concussion after hitting your head? How dangerous are concussions? What should you do to treat one? How do you prevent yourself from getting one?