List of mass panic cases

In sociology and psychology, mass hysteria is a phenomenon that transmits collective illusions of threats, whether real or imaginary, through a population and society as a result of rumors and fear. In medicine, the term is used to describe the spontaneous manifestation—or production of chemicals in the body—of the same or similar hysterical physical symptoms by more than one person.

A common type of mass hysteria occurs when a group of people believes that they have a similar disease or ailment, sometimes referred to as mass sociogenic illness or epidemic hysteria.