Mild traumatic brain injury or concussion is a very common condition, occurring with increasing frequency. In the U.S., approximately 1.7 million traumatic brain injury (TBI) patients seek medical care, and worldwide there are about 10 million cases per year. However, it is likely these numbers grossly underestimate the burden of disease and the actual cases are much higher. The media, the U.S. Department of Defense, and medical providers have heightened public awareness regarding concussion. A variety of clinical tools have been developed to identify concussion at the point of injury. Clinical practice guidelines have been introduced. Although treatment remains supportive, with proper care, the prognosis for a full recovery from concussion is excellent.