![healthcare worker reviewing brain scans](https://cdn.powa.com/www.leekelaw.com/images/wp-content/uploads/2023/04/healthcare-worker-reviewing-brain-scans-300x169-300-critical-desktop.jpg.webp)
A traumatic brain injury (TBI) is a severe injury that happens when a person suffers a hard impact to the head. TBIs can seriously disrupt normal brain function, such as by decreasing cognitive ability. A TBI can be spotted by looking at its symptoms. The symptoms of a TBI vary based on how severe the …