Cerebral palsy (CP) is primarily caused by **brain injury or abnormal brain development** that occurs before, during, or shortly after birth. This injury affects the parts of the brain responsible for controlling movement, muscle tone, and posture, leading to the motor impairments characteristic of CP. The causes of this brain injury are diverse and can be grouped into several categories, each involving different mechanisms and risk factors.
One of the most common causes is **hypoxic-ischemic injury**, which refers to a lack of oxygen (hypoxia) and/or blood flow (ischemia) to the developing brain. Brain cells require a continuous supply of oxygen and glucose to produce energy; when this supply is interrupted, brain cells can become damaged or die. This type of injury often occurs during the perinatal period—the time shortly before, during, and after birth—when the brain is especially vulnerable. For example, compression of the umbilical cord during delivery can reduce blood flow and oxygen delivery to the infant’s brain, causing hypoxic-ischemic injury[3].
**Birth complications** are a significant cause of cerebral palsy. These include fetal distress, prolonged labor, or trauma during delivery such as improper use of forceps or vacuum extractors. Such complications can lead to brain injury through mechanical trauma or oxygen deprivation. Intracranial hemorrhages (bleeding within the brain) during birth can also cause damage leading to CP[2][3].
**Premature birth and low birth weight** are important risk factors. Premature infants have underdeveloped brains that are more susceptible to injury, including bleeding in the brain’s ventricles (intraventricular hemorrhage) and white matter damage (periventricular leukomalacia). These injuries disrupt the brain’s motor pathways and contribute to CP[2].
**Infections and inflammation** during pregnancy or shortly after birth can also cause brain injury. Maternal infections such as chorioamnionitis (infection of the fetal membranes) can trigger inflammatory responses that harm the developing brain. Similarly, neonatal infections can lead to brain inflammation and injury[2].
Recent research has highlighted the role of **metabolic factors** in cerebral palsy. A Mendelian randomization study identified specific serum and cerebrospinal fluid metabolites, such as methionine sulfone, that are associated with CP risk. These findings suggest that disruptions in metabolic pathways, including glyoxylate, dicarboxylate, and butyrate metabolism, may contribute to the pathogenesis of cerebral palsy, opening new avenues for therapeutic intervention[1].
**Genetic factors** are increasingly recognized as contributors to cerebral palsy. Mutations or variants in certain genes can disrupt brain development or increase vulnerability to injury. Some of these genetic changes occur spontaneously (de novo mutations) and have been found more frequently in individuals with CP. While genetics alone may not cause CP, they can interact with environmental factors to influence the risk and severity of brain injury[5].
**Medical errors or negligence** during pregnancy, labor, or delivery can also cause cerebral palsy. Examples include failure to monitor fetal distress, improper use of delivery instruments, or delayed emergency interventions. Such preventable injuries are sometimes grounds for malpractice claims[2].
Ongoing research aims to improve early detection and intervention for cerebral palsy. For instance, a project funded by the Eunice Kennedy Shriver National Institute of Child Health and Human Development is developing tools to analyze vital signs in neonatal intensive care units to identify infants at high risk for CP. Early identification allows for timely therapies during critical periods of brain development, potentially improving outcomes[4].
In summary, cerebral palsy results from a complex interplay of factors causing brain injury or abnormal brain development. These include hypoxic-ischemic events, birth trauma, prematurity, infections, metabolic disturbances, genetic mutations, and sometimes medical errors. Understanding these causes helps guide prevention, early diagnosi
