In this episode, we will discuss comorbid diagnoses of pre-existent attention-deficit/hyperactivity disorder (ADHD) and traumatic brain injury (TBI) and its ability to increase the severity of symptoms and prolong the recovery process. A great number of symptoms overlap both conditions leading to significant lifetime disorder when ADHD and TBI are presented together. Other area's discussed within this episode are other underlying neurological mechanisms of ADHD that affect mild traumatic brain injury (mTBI): Symbol Digit Modalities Test (SDMT), the Trail Making Test, Part A and Part B; and the Digit Span (DS) when comparing control scores to test subject scores. Lastly, discussion on patients diagnosed with ADHD have experienced an increased rate of concussions, the most common subtype of TBI. This has been found common in pediatrics, athletes and has lifelong consequences.