When someone thinks about concussions, athletes and sports may come to mind. Yet there are millions of untold stories of people who sustain traumatic brain injuries, or TBI, in their everyday lives. Your loved one could suffer a concussion in a fender bender, or from a fall in the home. People can suffer a brain injury without realizing it or getting properly diagnosed. Left undiagnosed and untreated, a brain injury can greatly affect how a person thinks and acts, according to the Defense and Veterans Brain Injury Center — and in some cases having lasting consequences.