A traumatic brain injury (TBI) refers to an injury caused by an impact or bump to the head that interrupts the brain’s normal function. The CDC states that the majority of TBIs that happen every year are mild and occasionally known as concussions. Mild traumatic brain injuries may alter brain activity, resulting in fatigue, headaches, irritability, and disorientation. Concussions are medically defined as a clinical syndrome displaying immediate and transient shifts in brain function. A direct hit to the head, such as in a car accident, falling, or having an object hitting your head, can cause a concussion. Rapid acceleration-deceleration of the head, such as in blast injuries or whiplash can also cause concussions.