The issue of concussion in sport is a matter of global public interest that is currently under dispute by educational, legal, and medical professionals and scientists. In this article we discuss the problem from philosophical, bioethical, and sports ethical perspectives. We articulate conceptual differences in approaches to definition and therefore diagnosis of concussion. We critically review similarities and differences in the leading consensus statements that guide the treatment of concussion diagnosis and treatment in sports. We then present a series of ethical problems including issues that relate to paternalistic intervention in the lives of athletes in order to prevent harm to athletes, conflicting and competing interests, and confidentiality.