Why do Muslims marry cousins

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First-cousin marriages are common among Muslims. In fact, a majority of unions in Pakistan are first-cousin marriages. And it's been for millennia in Muslim-majority nations in the Middle East and North Africa, reflecting longstanding cultural, economic and social patterns that differ sharply from practices in most Western and non-Muslim societies.

Why them and not us?

I turned to chatGPT for a few answers.

In 1 AD there were about 100–120 distinct tribes or people groups in Western Europe. The pickings were slim, as the saying goes, as the area's population was only inhabited by about 25 million of us scattered across a continent. That considerably less than half the population of today's England (56.3 million), not counting Wales, Scotland, and Northern Ireland. These were often isolated in smaller clans.

My point is this: Even though we have fewer opportunities to find mates outside our families, we managed to avoid hooking up with first cousins. Royalty was, of course, an obvious exception.

Global Patterns and Legal Status

Pakistan reports consanguineous marriages — primarily between first cousins — in nearly two-thirds of cases, far exceeding global averages. Rates hover between 20% and 50% in much of the region, creating what demographers describe as a distinct “cousin marriage belt.” By comparison, the practice is exceedingly rare elsewhere, with U.S. estimates at roughly 0.2% of marriages and similarly low figures across Europe, East Asia and Latin America outside specific immigrant or regional pockets.

To most of us, it appears, the practice is disgusting.

Most countries permit first-cousin unions without restriction. In the United States, such marriages are legal in about half the states, though banned or restricted in others and criminalized in eight. Bans exist in nations including China, South Korea and the Philippines.

Health Implications

Medical research consistently shows elevated health risks. Children born to first cousins face approximately double the baseline rate of congenital anomalies, climbing higher when the pattern repeats across generations. In Britain’s Bradford, where many families trace roots to Pakistan, such unions have been tied to a markedly higher share of genetic disorders among newborns.

In Pakistan, the preference stems from intensive kinship systems that treat extended families as economic and social safety nets. Marrying within the clan helps keep agricultural land intact amid equal inheritance divisions among sons, lowers dowry expenses and maintains geographic proximity. Strict gender segregation in rural and conservative settings further narrows partner choices to relatives. High fertility rates have historically expanded the pool of available cousins.

This, alone, is cause to ban Muslim migrants. Their traditions of knot tying among first cousins brings health care needs and the costs.

Let's get to the 'why'

The custom predates modern religions but diverged historically. Islamic scripture permits cousin marriages, a practice observed by the Prophet Muhammad and enshrined in legal traditions. Early Christianity took the opposite path: starting around 500 A.D., the Catholic Church progressively restricted kin marriages, at one point barring unions as distant as sixth cousins. That policy, later moderated, eroded tight clan structures in Europe, favoring nuclear families and trust-based institutions with non-relatives — developments credited with aiding the growth of guilds, corporations and broader civic cooperation.

In short, Muslims marry cousins because of tradition and because Islam permits it. I would like to add, 'because they're stupid' or some snide remark about a goat shortage or, maybe, the same reason they poop in the street, but I won't because I don't want my house bombed.

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Fewer cousins marrying in Bradford's Pakistani community
Roman Catholic Church ban in the Middle Ages loosened family ties
Bradford study finds higher birth defect risk in married cousins
Keeping it in the family: consanguineous marriage and genetic disorders, from Islamabad to Bradford