Child marriage is a human rights violation. It happens when one or both people in a union are married under the age of 18. Today, an estimated one in five girls worldwide is married during their childhood. Even where laws exist to prevent it, child marriage continues because of deeply rooted social norms and economic pressures. Girls are often forced into marriages that end their education, limit their choices, and put their health and safety at risk. Understanding why child marriage happens — and what it costs girls and communities — is essential to ending it.
Why does child marriage happen?
Child marriage does not have a single cause. Instead, it’s driven by interconnected social, economic, and cultural factors that shape how girls are valued and treated.
In many communities, girls are seen primarily as future wives and mothers, with their worth tied to ideas about virginity, obedience, and family honor. This leads to strict control over girls’ behavior, movements, and choices — including decisions about when and whom they marry. Social norms passed down through generations make child marriage feel normal and expected, particularly once girls begin menstruating.
Poverty makes these pressures worse. Nearly 40% of girls in the world’s poorest countries are married as children. Families facing economic hardship may see marriage as a way to reduce household costs, receive a bride price, or avoid higher dowry payments. When girls lack access to education and economic opportunity, marriage can feel like the only option available to them.
Child marriage increases sharply in crisis settings, including conflict, displacement, and natural disasters. Families may believe an early marriage will protect girls from violence or help them survive deepening poverty. In these situations, child marriage can even be used to hide trafficking, exploitation, and abuse.
