Yes. A person suffering from a minor brain injury can still have cognitive difficulties, personality changes, memory problems, etc. just like a person suffering from a serious traumatic brain injury. In some cases the minor TBI may be more difficult to cope with because it is much harder to recognize that you even have an injury and that the symptoms you are suffering from are due to that injury. With any kind of brain injury it is necessary to be evaluated by a neurologist that has experience with minor and serious traumatic brain injuries.