A figure that leaves no room for ambiguity: more than one in ten marriages worldwide still unite related individuals such as cousins. In some regions, this practice is not just an exception but a displayed social norm. In Pakistan, the rate of marriages between first cousins approaches 60%, a proportion that astonishes observers from other cultures. Gulf countries and North Africa show similar figures. Meanwhile, Western legislation strictly prohibits these unions, relegating them to the shadows of history or social margins. The medical consequences are relentless: documented increases in rare genetic diseases and heightened risks for offspring. Yet, these marriages persist, rooted in economic, religious, or cultural reasons. It is not for lack of alerts or recommendations from public health institutions.
Consanguinity around the world: what is it really about?
Consanguinity refers to the union between two individuals from the same lineage, often first or second cousins. In many countries, consanguineous marriage is part of a deeply entrenched family organization, sometimes motivated by the desire to preserve assets, consolidate alliances, or ensure group stability. This is where the coefficient of consanguinity comes into play: this figure measures the probability that two parents will pass on identical genes inherited from a common ancestor to their child.
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The distribution of this phenomenon varies greatly across the world. In the Maghreb, the Middle East, and South Asia, marriages between first cousins persist and, in some villages, even set records. In contrast, in most Western countries, marriage prohibitions inspired by canon law have established prohibitions that severely limit these unions.
Scientists are categorical: the closer the kinship, the greater the risk for offspring to be exposed to autosomal recessive diseases, congenital anomalies, or rare genetic diseases. Today, nuance is necessary: risks are precisely measured according to the degree of cousinship, prenatal screening is refined, and genetic counseling is deemed essential by health professionals.
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For a detailed view on this issue, the rate of consanguinity by country provides a comprehensive and updated panorama of the international situation.
Which countries are most affected and why do these practices persist?
The global face of consanguinity reveals impressive contrasts, often stemming from tradition and cultural context. In the Maghreb, Morocco, Tunisia, and Egypt, between 20% and 30% of couples share a close family link, sometimes more in certain rural areas. The Middle East is no exception: in Qatar, Saudi Arabia, or in some families in the United Arab Emirates, half of the unions remain “intra-clan.” And South Asia, particularly Pakistan, exceeds all averages with nearly half of marriages contracted between members of the same extended family.
To gauge the extent of disparities by country, we can rely on these reference data compiled by research organizations:
| Country | Estimated Rate |
|---|---|
| Pakistan | 50% |
| Qatar | 50% |
| Egypt | 20-30% |
| Morocco | 20-25% |
| Tunisia | 20-25% |
Why do they cling to it? The reasons put forward by sociologists are numerous: tradition, the search for family stability, sometimes the desire to protect heritage or to follow a religious prescription. In contrast, European history has been shaped by prohibition through canon law and civil regulation, pushing these practices into near-total marginality. More recent laws have formalized the erasure of consanguinity from official practices in many Western countries.
Health sanctions, social challenges: better understanding the phenomenon
Consanguinity leaves clear marks on collective health. An increase in the number of genetic diseases, a rise in autosomal recessive diseases: in regions where family unions are common, medical records attest to this. The risk is not limited to theory and concerns an increasing number of families worldwide.
Beyond medicine, social issues are also measured. Healthcare structures face a growing demand for prenatal screening or genetic counseling, while families sometimes have to deal with silence or fear of being stigmatized.
To shed light on these realities, here are the effects noted by studies and specialized observers:
- Health risks: increased transmission of genetic diseases, occurrence of disabilities, possible reduction in life expectancy for some children born from consanguineous unions.
- Social tensions: the weight of family demands, the maintenance of traditions despite evolving norms, difficulty accessing reliable information tailored to local specifics.
On the ground, researchers and healthcare professionals are multiplying tools and support systems to try to reduce genetic incidence and improve prevention. Better understanding the frequency of consanguinity in a region also helps to adjust strategies, offer relevant support, and respond to often complex family situations.
Far exceeding borders and statistics, consanguinity compels each society to question its certainties, its transmissions, and its vulnerabilities. Between the weight of heritage and collective choices, this issue remains one of the great silent revealers of our ways of life and what we collectively decide to transmit or transform.