It is not whether the injuries are major that determines whether or not you can sue. You can sue only if the injuries were caused by the negligence of another person. If negligence occurred , you can sue even if the injuries were minor, although your recovery in damages would be as minor as your injuries. If this is an auto accident matter, some states have laws that state that you cannot sue unless you do have major injuries even if there were no negligence. Check the laws of the state the accident occurred in to get proper information.