Cerebral palsy: causes, types, diagnosis and care

Causes and risk factors

Cerebral palsy arises when brain development is interrupted by injury, abnormal formation or disrupted blood flow. Causes include prenatal events (infections, genetic and developmental abnormalities), perinatal complications (severe oxygen deprivation at birth) and, less commonly, postnatal events (infections, head trauma or stroke in infancy). Known risk factors are prematurity, low birth weight, multiple pregnancy and some maternal illnesses, though many cases have no clearly identifiable single cause.

Signs, types and distribution

Symptoms vary widely in severity and combination. Key features are difficulties with voluntary movement, abnormal muscle tone, balance and coordination. Additional problems can include intellectual disability, epilepsy, vision or hearing impairments and speech difficulties. Clinicians commonly describe CP by both type of movement disorder and body regions affected.

• Movement types: spastic (stiff muscles; most common), dyskinetic (involuntary movements, including athetoid or dystonic patterns), ataxic (poor balance and coordination), and mixed forms.
• Distribution: hemiplegia (one side), diplegia (primarily legs), quadriplegia (all four limbs) — labels that indicate which limbs are most affected.

Diagnosis and management

Diagnosis is clinical, based on developmental history and neurological examination, and is often supported by neuroimaging such as MRI to identify brain abnormalities. Early detection allows earlier intervention, which can improve outcomes.

Management is multidisciplinary and individualized. Common components include:

• Physiotherapy, occupational therapy and speech and language therapy to maximize function and independence.
• Medical treatments for symptoms: muscle relaxants, botulinum toxin for focal spasticity, seizure control when needed.
• Orthopedic procedures and selective dorsal rhizotomy in selected cases, plus assistive devices (walkers, wheelchairs, communication aids).
• Ongoing family support, educational services and social care to address participation and quality of life.

History, prevalence and outlook

CP was first described in the 19th century and is often associated with the English surgeon William Little, who reported early observations in the 1860s. Worldwide prevalence is commonly cited in the range of about 2–3 per 1,000 live births, though rates vary by region and diagnostic practices. In some countries the estimated childhood prevalence is close to 1 in 400.

Prognosis depends on severity and associated conditions. Many individuals with milder forms can walk, work and form families; others require lifelong, comprehensive care. Research continues into prevention, better early detection and therapies to improve function and participation for people with cerebral palsy.