What is the biggest risk factor for cerebral palsy in Arab countries?

Birth asphyxia — oxygen deprivation around the time of birth — is by far the largest single risk factor for cerebral palsy in Arab countries. In the Palestinian case-control study, perinatal hypoxia was associated with 92.5 times higher odds of CP (versus 4.6 times for consanguinity). In the 2022 systematic review across Arab countries, birth asphyxia accounted for 16% of CP cases, prematurity for 12.2%, and low birth weight for 9.7%. This context matters: consanguinity is a real risk factor, but it is not the dominant one. Improvements in obstetric care and neonatal services would prevent far more cases of CP in the Arab world than any change in marriage patterns.

What should a family with consanguineous parents do before pregnancy?

Pre-conception genetic counselling is the most useful step available. A genetic counsellor can review your family history, assess the likelihood that you and your partner carry matching recessive genetic variants, and recommend specific genetic tests if appropriate. This is especially important if there is already a child in the family with a developmental condition, or if CP or other neurodevelopmental disorders run in the extended family. Pre-conception counselling doesn't require you to change any decisions — it gives you information to make those decisions with full awareness.

If we are cousins and already have a child with CP, what is the risk for future pregnancies?

The answer depends on what caused the CP. If the cause was birth asphyxia, prematurity, or another non-genetic event — which accounts for the majority of CP cases — then the risk for subsequent children is not significantly elevated beyond the general population risk. If there is a genetic component (suggested by multiple family members with developmental conditions, a normal MRI, or a pattern consistent with recessive inheritance), then the risk may be meaningfully higher. A geneticist or genetic counsellor can review the specific family history and the child's clinical picture to give you a more personalised assessment.

Does a normal MRI rule out a genetic cause of my child's CP?

Not entirely. A normal brain MRI is found in roughly 10 to 20% of children with a clinical diagnosis of CP. When MRI is normal and the family history includes consanguinity or other members with developmental conditions, the likelihood of a genetic or metabolic cause is higher than in the general CP population. In these cases, referral to a clinical geneticist for further evaluation (expanded genetic panel testing, metabolic workup) is appropriate. Genetic causes of CP are thought to account for a small but non-trivial percentage of all cases, and the proportion is likely higher in consanguineous populations.

What is the overall CP rate in Arab countries compared to globally?

The pooled prevalence of cerebral palsy in Arabic-speaking countries is approximately 1.8 per 1,000 live births, compared to the global average of 2 to 2.5 per 1,000 live births. However, this figure likely reflects under-reporting and diagnostic limitations rather than genuine lower prevalence. The pattern of CP in Arabic-speaking countries differs from global averages in one notable way: spastic CP accounts for approximately 59.8% of cases in Arab countries versus 85 to 90% globally — a difference that researchers believe may reflect the higher proportion of cases with genetic or metabolic causes rather than the typical hypoxic injury pattern.

Consanguineous Marriage and Cerebral Palsy: What the Research Actually Shows

Causes & Prevention 13 min read

Consanguineous Marriage and Cerebral Palsy: What the Research Actually Shows

Q: Does cousin marriage cause cerebral palsy?

Cousin marriage doesn't directly cause cerebral palsy in the way that, for example, oxygen deprivation at birth causes it. What consanguinity does is increase the statistical likelihood that two parents carry the same recessive genetic variants — and when that happens, some of those variants can affect brain development or increase susceptibility to brain injury. A major case-control study of Palestinian children found that having consanguineous parents was associated with roughly 4.6 times higher odds of cerebral palsy compared to non-consanguineous families, after adjusting for all other variables. That is a real and significant association. It doesn't mean that most children of consanguineous parents will have CP — most won't. It means the risk is meaningfully elevated compared to the general population.

Q: Is consanguineous marriage common in Arab countries?

Yes — significantly more so than in other parts of the world. Estimated consanguinity rates vary by country: Egypt approximately 68%, Jordan 58%, Saudi Arabia 58%, Kuwait 54%, UAE 51%, and Palestine 45%. Across Arab-speaking countries as a whole, intrafamilial partnerships account for 20 to 50 percent of all marriages, which is substantially higher than rates in Western Europe, East Asia, or sub-Saharan Africa. This is why the relationship between consanguinity and CP is particularly relevant to study in the Arab world.

Q: Is consanguineous marriage forbidden in Islam?

No. Cousin marriage is explicitly permissible in Islam. This article does not suggest otherwise. The Prophet Muhammad married his cousin Zainab bint Jahsh. Islamic jurisprudence across all four major schools of thought permits first-cousin marriage. This article discusses health risk data — it does not make religious or moral judgments about family decisions. Families who choose consanguineous marriage for cultural, social, or family reasons are making a legally and religiously permitted choice. What this article is for is helping those families understand the health considerations so they can seek appropriate monitoring and care.

There is almost no Arabic-language content on this topic. That silence isn’t protecting anyone — it’s leaving families without information they need to make informed decisions about pregnancy care. This article covers what research studies actually show about the relationship between cousin marriage and cerebral palsy, honestly and without judgment.

Written by CP Clinic Medical Team Tovmed Medical Center, Vinnytsia, Ukraine

Medically reviewed by Prof. Vigein Tovmasian PhD · Orthopedic Surgeon · Honorary Doctor of Ukraine

Why this topic has been avoided — and why that’s a problem

Consanguineous marriage — marriage between cousins or other relatives — is practised across the Arab world, sanctioned by Islamic jurisprudence, and a longstanding part of family and social structure in many Arab communities. This article is not here to challenge any of that. First-cousin marriage is explicitly permissible in Islam. Families who choose it do so for social, familial, and cultural reasons that are legitimate and legal.

What this article is here to do is address the near-complete absence of honest, Arabic-language information on a public health reality: research studies do show a genuine association between consanguinity and elevated risk of cerebral palsy. Families who are not given this information cannot make informed decisions about prenatal care. Doctors who are uncomfortable raising the topic leave parents without guidance they could act on.

The purpose of this article is not to make families feel guilty for choices they’ve made, nor to discourage any particular family structure. It’s to fill an information gap that leaves families in the dark about risks that — in many cases — can be meaningfully reduced with the right prenatal care and monitoring.

A note on framing: This article will use research data, including odds ratios from published studies. An “odds ratio” of 4 doesn’t mean 4 out of every 5 children will be affected. It means the statistical likelihood is four times higher than the baseline — a meaningful difference, but not a certainty. The majority of children born to consanguineous parents do not develop cerebral palsy.

How common consanguineous marriage is in Arab countries

In most of the world, cousin marriage accounts for a small minority of unions. In the Arab world, the picture is quite different. Estimated consanguinity rates from the WHO Eastern Mediterranean region:

Egypt68%of marriages

Saudi Arabia58%of marriages

Jordan58%of marriages

Kuwait54%of marriages

UAE51%of marriages

Palestine45%of marriages

Across Arab-speaking countries as a whole, intrafamilial partnerships account for 20 to 50 percent of all marriages. A 2022 systematic review found that approximately 37.7% of children with cerebral palsy in Arabic-speaking countries were born from consanguineous marriages — a figure roughly in line with the general consanguinity rate, but one that has been studied specifically to understand whether the proportion in CP populations is higher than in the general population.

The high rates across the region make this an important area to study, and to communicate clearly to families.

What the research actually shows

The strongest available study in the Arab world is a case-control study conducted by researchers from Al-Quds University, published in the WHO Eastern Mediterranean Health Journal. It compared 107 children with cerebral palsy to 223 children without CP, specifically examining consanguinity alongside all other known risk factors.

The results on consanguinity were clear:

47.7% of children with CP had consanguineous parents (first or second cousins)
24.2% of children without CP had consanguineous parents
After adjusting for all other variables, consanguinity was associated with an odds ratio of 4.62 (95% CI: 2.07 to 10.3) — meaning roughly 4.6 times higher odds of cerebral palsy

A 2022 systematic review covering 32 studies across 7 Arab countries confirmed these findings, concluding that consanguinity is a significant and population-specific risk factor for CP in Arabic-speaking countries.

The table below places consanguinity in context with the other significant risk factors identified in the Palestinian study:

Risk Factor	Odds Ratio (adjusted)	What this means
Perinatal hypoxia (oxygen deprivation)	92.5×	By far the dominant risk factor
Birth defects in other family members	12.7×	Suggests hereditary/genetic component
Multiple births (twins)	9.25×	Significant, especially for second twin
No prenatal medical care	5.22×	Preventable with system access
Consanguineous parents	4.62×	Real, significant, partially modifiable
Low birth weight (<2,500g)	4.98×	Related to prematurity

Source: Daher & El-Khairy, WHO EMHJ 2014 (Palestinian population, case-control study, n=330)

The association is real, statistically significant, and has been replicated across multiple studies in the region. It is also, as the table makes clear, not the largest risk factor for CP. That context matters.

Context: the biggest CP risk factor dwarfs all others

Birth asphyxia — oxygen deprivation during or immediately around delivery — was associated with 92.5 times higher odds of CP in the Palestinian study. For comparison, consanguinity was associated with 4.62 times higher odds. These are not the same order of magnitude.

Across Arab-speaking countries in the 2022 systematic review, the leading causes identified were birth asphyxia (16% of cases), prematurity (12.2%), and low birth weight (9.7%). Perinatal hypoxia rates are substantially higher in the Arab world than in high-income countries, largely due to differences in obstetric emergency response, availability of fetal monitoring, and access to timely caesarean sections when fetal distress is detected.

If you’re looking at what a population-level intervention would prevent the most CP cases in the Arab world, it isn’t changing marriage patterns. It’s improving birth monitoring, obstetric emergency response, and neonatal resuscitation capabilities. Families who understand this can also understand that consanguinity is a real but contextually smaller piece of a larger picture.

This context doesn’t diminish the consanguinity data. A 4.62-fold increase is clinically meaningful. But it does mean that a consanguineous couple who receive excellent prenatal care, careful birth monitoring, and immediate neonatal support are doing far more to protect their child than a non-consanguineous couple who don’t receive adequate obstetric care.

Why consanguinity increases risk: the genetic mechanism

To understand the link, it helps to understand what consanguinity does genetically. When two people who are closely related have a child, the child is more likely to inherit two copies of the same genetic variant — one from each parent — because both parents carry the same inherited material from shared ancestors.

Most of the time, this has no effect. But some genetic variants are what geneticists call “autosomal recessive” — they only cause a health problem if a person inherits two copies. A person with one copy is a carrier and is unaffected. When two carriers have a child together, there is a 25% chance the child inherits both copies and is affected.

Shared ancestry means shared variants Cousins share approximately 12.5% of their genetic material (first cousins). Both may carry the same recessive genetic variants inherited from common grandparents.
Recessive inheritance becomes more likely When two carriers have a child, there is a 25% probability the child inherits both copies of the variant and is affected. In non-related couples, both parents are far less likely to carry the same recessive variant.
Some variants affect brain development Specific autosomal recessive genetic conditions cause abnormal brain development, brain malformations, or metabolic disorders that injure the developing brain. These can produce symptoms identical or similar to those caused by CP from other causes.
Some variants increase susceptibility to injury Beyond direct brain malformation, some genetic variants may make the developing brain more vulnerable to damage from secondary insults like hypoxia, infection, or prematurity — compounding the risk when those events occur.

This genetic mechanism explains a specific clinical pattern observed in consanguineous CP populations: children whose MRI is normal (no visible structural brain injury), but who have developmental conditions that don’t follow the typical CP presentation. When this pattern appears alongside a consanguineous family background, a genetic workup is warranted.

It also explains why having another family member with a developmental condition is such a strong risk signal — the Palestinian study found that birth defects in other family members carried an odds ratio of 12.7, among the highest in the entire study.

What families can actually do

The purpose of this information is not to change family decisions. It’s to help consanguineous couples understand what additional care and monitoring is available to them — because the risk is not fixed. A lot of it is modifiable.

Before pregnancy

Pre-conception genetic counselling

Review family history for any developmental conditions, rare diseases, or childhood deaths
Genetic carrier testing where available — panels can identify if both partners carry specific recessive variants
Especially important if there is already a child in the family with CP or a developmental disorder
Consult a geneticist if multiple family members have been affected

During pregnancy

Enhanced prenatal monitoring

Regular prenatal check-ups throughout pregnancy — the Palestinian study found lack of prenatal care carried a 5.22-fold increase in CP risk
Detailed fetal anatomy ultrasound at 18–20 weeks — identifies structural brain anomalies if present
Fetal growth monitoring in later pregnancy
Discuss with your obstetrician whether any additional genetic or metabolic tests are appropriate for your family history

At delivery and after

Birth monitoring and neonatal care

Deliver in a facility with continuous fetal heart rate monitoring during labour
Ensure the facility has trained staff and equipment for neonatal resuscitation
If the baby requires resuscitation, jaundice treatment, or neonatal intensive care — follow all recommendations fully
Ask about newborn screening for metabolic disorders where this is available

Developmental monitoring

Watch for early signs

Know the developmental milestones for the first 12 months
If the baby shows asymmetric movement, very high or very low muscle tone, feeding difficulty, or delayed milestones — seek assessment early
Consanguineous families with a previous CP child should flag this background to any specialist they see

Where to access genetic counselling in Arab countries: Dedicated genetic counselling services exist in most major hospitals in Saudi Arabia, UAE, Jordan, and Egypt. In Saudi Arabia, the National Newborn Screening Programme and King Faisal Specialist Hospital have dedicated genetics services. In Egypt, the Human Genetics Department at Cairo University Hospital. In Jordan, the Jordan University Hospital genetics clinic. If in-person access is limited, telemedicine genetics consultations are increasingly available from specialists based in these countries and internationally.

For families where a child already has CP

If you’re reading this because your child already has a diagnosis of cerebral palsy and you’re trying to understand whether consanguinity played a role, or what the implications are for future pregnancies, here’s what the evidence can tell you.

Understanding your child’s specific case

The cause of CP matters enormously for the question of recurrence risk. If your child’s CP was caused by birth asphyxia, prematurity, or a documented event around delivery — which is the case for the majority of CP diagnoses — then consanguinity was unlikely the primary cause, and the risk for future pregnancies is not significantly elevated beyond the general population baseline.

If your child’s CP presentation is unusual — normal MRI, family members with similar conditions, or symptoms that don’t fit the typical acquired brain injury pattern — then a genetic investigation may be warranted. Some genetic causes of CP have a 25% recurrence risk (autosomal recessive), which is meaningful and should inform family planning discussions with a geneticist.

Asking the right question

The question to bring to your child’s specialist is: “Based on my child’s MRI results, clinical presentation, and our family history, do you think there could be a genetic component to their condition?” If the answer is “possibly” or “we don’t know,” a referral to a clinical geneticist is appropriate.

Planning future pregnancies

If a genetic cause has been identified, preimplantation genetic diagnosis (PGD) is technically available as part of IVF treatment, though access in Arab countries varies. Prenatal genetic testing during pregnancy (chorionic villus sampling or amniocentesis) can identify whether a foetus has inherited the same condition in families where a specific genetic diagnosis has been made. These options are worth discussing with a geneticist, regardless of whether you ultimately choose to pursue them.

Questions about CP diagnosis, causes, or what treatment options exist for your child? We’re here for all of them.

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Frequently asked questions

Does cousin marriage cause cerebral palsy?

Not directly, in the way that oxygen deprivation at birth causes it. What consanguinity does is increase the probability that both parents carry the same recessive genetic variants, and some of those variants can affect brain development. A case-control study of Palestinian children found consanguinity was associated with roughly 4.6 times higher odds of CP after adjusting for all other variables. Most children of consanguineous parents won’t develop CP — but the risk is meaningfully elevated compared to the general population.

Is consanguineous marriage forbidden in Islam?

No. Cousin marriage is explicitly permissible in Islam across all four major jurisprudential schools. This article discusses health risk data — it doesn’t make religious or moral judgments. Families who choose consanguineous marriage are making a legally and religiously permitted choice. This article helps those families understand the health considerations so they can seek appropriate monitoring and care.

What is the biggest risk factor for CP in Arab countries?

Birth asphyxia — oxygen deprivation around the time of delivery — is associated with 92.5 times higher odds of CP in the Palestinian study. Consanguinity was associated with 4.62 times higher odds. Improving birth monitoring and obstetric emergency response would prevent far more CP cases in the Arab world than any change in marriage patterns. Consanguinity is a real but contextually smaller risk factor.

What should a consanguineous couple do before pregnancy?

Pre-conception genetic counselling is the most useful step. A genetic counsellor can review your family history, assess shared risk, and recommend genetic tests if appropriate. This is especially important if another family member has a developmental condition, or if CP or similar disorders run in the extended family. It doesn’t commit you to any decisions — it gives you information to make them with full awareness.

If we’re cousins and already have a child with CP, what’s the risk for future pregnancies?

It depends heavily on the cause. If CP was caused by birth asphyxia or a delivery complication, recurrence risk for future pregnancies is not significantly elevated. If there’s a genetic component (suggested by normal MRI, multiple family members affected, or an unusual clinical pattern), the risk may be meaningfully higher. A clinical geneticist can review the specific case and give you a personalised assessment.

Does a normal brain MRI rule out a genetic cause?

Not entirely. Around 10 to 20% of children with a clinical CP diagnosis have a normal brain MRI. When MRI is normal and there’s consanguineous family background or other family members with developmental conditions, a genetic cause is more likely than in the general CP population. Referral to a clinical geneticist for expanded genetic panel testing is appropriate in these cases.

What is the overall rate of CP in Arab countries compared to globally?

The pooled prevalence in Arabic-speaking countries is approximately 1.8 per 1,000 live births, compared to the global average of 2 to 2.5 per 1,000. However, researchers believe this lower figure reflects under-reporting rather than genuine lower prevalence. Notably, spastic CP accounts for only 59.8% of cases in Arab countries versus 85 to 90% globally — a difference that may reflect a higher proportion of cases with genetic or metabolic causes rather than the typical hypoxic-ischaemic pattern.

References

Daher S, El-Khairy L. “Association of cerebral palsy with consanguineous parents and other risk factors in a Palestinian population.” WHO Eastern Mediterranean Health Journal, 2014;20(7):459-468. WHO EMRO ↗
Almuqbel MM, et al. “Epidemiology of Cerebral Palsy among Children and Adolescents in Arabic-Speaking Countries: A Systematic Review and Meta-Analysis.” Brain Sciences, 2022;12(7):925. PMC ↗
Khayat AM, et al. “Consanguineous Marriage and Its Association With Genetic Disorders in Saudi Arabia: A Review.” Cureus, 2024 Feb;16(2):e53888. PubMed ↗
Hamamy H, et al. “Consanguineous marriages, pearls and perils: Geneva International Consanguinity Workshop Report.” Genetics in Medicine, 2011;13(9):841-7. PubMed ↗
El Goundali B, et al. “The Determinants of Consanguineous Marriages among the Arab Population: A Systematic Review.” International Journal of Preventive Medicine, 2022. PMC ↗
Novak I, et al. (2020). “State of the Evidence Traffic Lights 2019.” Current Neurology and Neuroscience Reports. PubMed ↗

Medical disclaimer: This article is for informational purposes. Individual genetic risk assessment requires consultation with a qualified clinical geneticist who has reviewed your specific family history. This article does not constitute medical advice for any individual family.