Mass hysteria, also known as collective obsessional behavior or mass psychogenic illness, is a phenomenon where a group of people experience similar physical or psychological symptoms without any underlying medical or environmental cause. The exact causes of mass hysteria are not fully understood, but some factors that may contribute to it include:

• Groupthink: This is a phenomenon where individuals in a group conform to the groups norms and values, even if it goes against their own beliefs. This can lead to a shared belief in a perceived threat or illness, which can trigger mass hysteria.

• Stress: Extreme stress or anxiety can also contribute to mass hysteria. For example, a strict school environment or a community disaster can create a tense environment that may trigger mass hysteria.

• Social pressure: Social pressure to conform to a groups beliefs or behaviors can also contribute to mass hysteria. This can be especially true in close-knit groups, such as schools or religious communities.

• Environmental triggers: Certain environmental factors, such as exposure to toxins or infectious agents, can also contribute to mass hysteria. For example, a group of people who believe they have been exposed to a toxic substance may experience similar symptoms, even if there is no actual exposure.

It is important to note that mass hysteria is a real phenomenon, and the symptoms experienced by those affected are very real, even if there is no underlying medical or environmental cause. Understanding the causes of mass hysteria can help prevent and manage outbreaks in the future.