Traumatic brain injury (TBI) is not an isolated event, but the beginning of a disease process. Even if you’ve never had a horrible accident, there are plenty of less stereotypical, every day occurrences of brain injury that you may have never considered. If you ever fell off the monkey bars, headed a soccer ball, got rear-ended in a car or thrown off a horse—even if you didn’t have traditional symptoms of concussion—these incidents may have had a lasting effect on your digestive system.