Which are the causes of Cerebral Palsy?

TL;DR: Cerebral palsy is caused by abnormal brain development or damage to the developing brain, typically occurring before, during, or shortly after birth. While the exact cause remains unknown in many cases, it is often the result of a complex interplay between prenatal factors, birth complications, and early postnatal events that disrupt the brain's ability to control movement and posture.

What are the primary causes of cerebral palsy?

Cerebral palsy is not a single disease but a group of disorders caused by injury to the motor control centers of the developing brain. Rather than a single "trigger," cerebral palsy often results from a cascade of events. For a long time, it was assumed that complications during labor and delivery were the primary culprits; however, modern clinical research indicates that only a small percentage (roughly 10% or less) of cerebral palsy cases are caused by birth asphyxia. Most instances occur during prenatal development due to factors like maternal infections, stroke in the fetus, or developmental malformations.

Is there a genetic component to cerebral palsy?

For many years, clinicians viewed cerebral palsy as purely an acquired injury. Recent advancements in genomic sequencing have shifted this perspective, revealing that approximately 14% to 30% of cases may have a significant genetic contribution. Researchers have identified mutations in specific genes—such as AP4B1, GAD1, and COL4A1—that can disrupt neuronal migration or brain structure. While these genetic findings do not mean the condition is always inherited from a parent, they highlight that some children are born with a biological predisposition to the brain abnormalities that result in a cerebral palsy diagnosis.

What are the known environmental risk factors?

It is crucial to distinguish between a direct cause and a risk factor. A cause is the direct mechanism of brain injury, whereas a risk factor increases the likelihood of that injury occurring. Important risk factors include:

• Preterm birth: Infants born before 32 weeks are at a significantly higher risk due to the vulnerability of the developing brain to fluctuations in blood pressure and oxygen.


• Low birth weight: Very low birth weight is strongly associated with the incidence of cerebral palsy.


• Multiple pregnancies: Twins, triplets, or higher-order births increase the risk, often related to preterm delivery.


• Infections: Maternal infections (such as cytomegalovirus, rubella, or toxoplasmosis) can cross the placenta and affect fetal brain development.


• Postnatal complications: Severe jaundice, brain infections like meningitis, or traumatic brain injuries in early infancy can lead to cerebral palsy.

Is the etiology of cerebral palsy fully understood?

Despite significant progress, the exact etiology of cerebral palsy remains elusive in many individuals. In the DiseaseMaps community, where 180 members share their experiences, many families report that a definitive "why" was never identified by their medical teams. Current research is heavily focused on the "two-hit" hypothesis, which suggests that a child may have a genetic vulnerability (the first hit) that makes the brain more susceptible to an environmental stressor during pregnancy or birth (the second hit). By studying these mechanisms, researchers hope to move toward earlier intervention and neuroprotective strategies.

Next steps

• Consult with a pediatric neurologist or a developmental pediatrician to discuss specific diagnostic testing or genetic counseling.


• Connect with the 180 members of the DiseaseMaps community to learn how others navigate the diagnostic and care journey.


• Discuss early intervention services with your healthcare provider, as these are critical for improving outcomes regardless of the specific cause.


• Review resources from the NIH or local cerebral palsy foundations to stay updated on the latest therapeutic research.

Medical disclaimer: This content is for informational purposes only and does not constitute professional medical advice, diagnosis, or treatment; always seek the advice of your physician or other qualified health provider with any questions you may have regarding a medical condition.

References

• National Institute of Neurological Disorders and Stroke (NINDS): Cerebral Palsy Information Page.


• Orphanet: Cerebral palsy (ORPHA:93960).


• OMIM (Online Mendelian Inheritance in Man): Cerebral Palsy, Spastic Quadriplegic, 1 (Entry #603513).


• CDC: Data and Statistics for Cerebral Palsy.