Nuclearism is the ideology of nuclear weaponry and nuclear arms-based security. It is the most depraved, shameless, and costly pornography of our times. Such an ideology cannot be judged only by the canons of international relations, geopolitics, political sociology, or ethics. It is also a well-known, identifiable, psychopathological syndrome. The following is a brief introduction to its clinical picture, epidemiology, and prognosis.