What is impostor syndrome?

People are described as suffering from impostor syndrome when they feel that their external markers of success are unwarranted, and fear being revealed as a fraud. Impostor syndrome is commonly framed as a troubling individual pathology, to be overcome through self-help strategies or therapy. But in many situations an individual’s impostor attitudes can be epistemically justified, even if they are factually mistaken: hostile social environments can create epistemic obstacles to self-knowledge. The concept of impostor syndrome prevalent in popular culture needs greater critical scrutiny, as does its source, the concept of impostor phenomenon which features in psychological research.