Yes. Epilepsy can occur alongside developmental disorders such as autism, intellectual disability, and delays in speech, movement, or learning. Sometimes both conditions are related to the same genetic change or difference in how the brain developed. In other cases, frequent seizures or unusual electrical activity in the brain may add to developmental difficulties. Having epilepsy does not automatically mean a person has a developmental disorder.
How Are Epilepsy and Developmental Disorders Connected?
Epilepsy is a neurological condition in which a person has a lasting tendency to experience recurrent, unprovoked seizures. Developmental disorders affect how a person learns, communicates, moves, behaves, or develops other skills. These conditions can occur together because some of the underlying factors affecting brain development also influence the brain's electrical activity.
According to the National Institute of Neurological Disorders and Stroke (NINDS), epilepsy can be associated with genetic factors, differences in brain development, and other neurological conditions. Developmental disorders such as cerebral palsy, autism spectrum disorder, and intellectual disability may also occur alongside epilepsy. However, the reason for the overlap differs from person to person.
Which Developmental Disorders May Occur With Epilepsy?
Autism spectrum disorder
Autism spectrum disorder (ASD) is a developmental condition that can affect social communication, interaction, behavior, and the way a person experiences or responds to the world. Autism and epilepsy are associated, although neither condition is present in everyone who has the other.
The Epilepsy Foundation describes the association between autism and epilepsy and discusses shared neurological mechanisms as one possible explanation. The relationship is complex, and the presence of autism does not establish that a person will develop seizures. Likewise, an epilepsy diagnosis does not mean that a person is autistic.
Developmental delay and intellectual disability
Developmental delay means that a child is acquiring skills later than expected for their age. It may affect one area, such as speech or movement, or several areas of development. Intellectual disability involves limitations in intellectual functioning and everyday adaptive skills, such as communication, learning, problem-solving, and independent living.
Both developmental delay and intellectual disability can occur in some forms of epilepsy, particularly when an underlying genetic condition or difference in brain development affects several areas of neurological function. The extent of the developmental impact depends on the underlying condition and the person's clinical circumstances.
Attention, learning, and behavioral difficulties
Some people with epilepsy experience difficulties with attention, memory, learning, or behavior. Attention-deficit/hyperactivity disorder (ADHD), a neurodevelopmental disorder, is also more common among children with epilepsy than among children in the general population. These difficulties may coexist with epilepsy, but they should not automatically be attributed to seizures.
The Epilepsy Foundation's information on epilepsy and ADHD explains that ADHD is an important co-occurring condition in children with epilepsy. When attention or school performance changes, clinicians may consider several possible explanations, including a coexisting developmental condition, seizure-related effects, sleep difficulties, or medication effects.
Why Can Epilepsy and Developmental Problems Occur Together?
There is no single explanation for every person. In clinical practice, three broad patterns help explain the relationship.
A shared underlying cause
Some genetic conditions or differences in brain structure can affect both development and the electrical activity that controls brain function. A child may therefore have seizures alongside difficulties with speech, movement, learning, or intellectual development. In these situations, epilepsy and the developmental disorder may be two features of the same underlying condition rather than one directly causing the other.
Seizures and abnormal electrical activity may affect development
Seizures involve sudden changes in the brain's electrical activity. In certain childhood epilepsy syndromes, frequent seizures or ongoing abnormal electrical activity between obvious seizures may interfere with learning or developmental progress. The potential effect depends on the epilepsy syndrome, the pattern of electrical activity, and other factors affecting the brain.
The Epilepsy Foundation's explanation of developmental and epileptic encephalopathy distinguishes developmental difficulties related to the underlying cause from additional difficulties associated with epileptic activity. Improving seizure control may help the part of the developmental problem linked to ongoing epileptic activity, although it may not resolve difficulties caused by the underlying condition.
A developmental condition may influence seizure risk
The relationship can also be seen from the other direction. Some developmental conditions are associated with a higher likelihood of epilepsy, but the level of risk differs by condition and individual circumstances. Having a developmental disorder does not mean that seizures are inevitable. The underlying diagnosis, medical history, and neurological findings help clinicians understand whether a closer assessment is appropriate.
What Developmental Changes May Be Relevant?
When epilepsy and development are being assessed together, healthcare professionals look at how a person's skills have developed over time. Examples of areas they may consider include:
- Speech and language skills, including understanding words and expressing needs.
- Movement and coordination, such as sitting, walking, or using the hands.
- Learning, memory, attention, and progress at school.
- Social communication, interaction, and patterns of behavior.
- Slower-than-expected progress or loss of skills that were previously acquired.
These are examples of developmental concerns, not a checklist for identifying a disorder. A child may have difficulties in one area while developing as expected in others. In particular, losing previously acquired language, movement, or other skills deserves prompt medical assessment, especially when the change occurs alongside new or changing seizures.
How Do Doctors Assess the Link Between Epilepsy and Development?
Assessment usually begins with a detailed medical and developmental history. Clinicians may ask when the seizures began, what happens during an episode, how often episodes occur, and whether developmental changes started before or after the seizures. Information from caregivers, school staff, and previous assessments can help clarify patterns over time.
Depending on the presentation, investigations may include an electroencephalogram (EEG), which records electrical activity in the brain; magnetic resonance imaging (MRI) to look for structural differences; or blood tests and other investigations when an underlying medical cause is suspected. Developmental, speech and language, learning, or psychological assessments may also help establish which areas need support.
Genetic testing may be considered when epilepsy occurs with developmental delay, intellectual disability, autism, or other features that suggest a genetic cause. The American Academy of Pediatrics explains that epilepsy in children can have structural, genetic, infectious, or metabolic causes and that the usefulness of genetic testing depends on the clinical situation. Not every person with epilepsy needs every test.
Does Epilepsy Always Lead to Developmental Difficulties?
No. Many people with epilepsy develop normally, learn effectively, and live independently. The association with developmental disorders is stronger in some epilepsy syndromes and underlying conditions than in others. Some people have seizures without a developmental disorder, while others experience developmental challenges that are not primarily caused by their seizures.
It is also important to distinguish a developmental disorder from difficulties that emerge later. An adult with epilepsy may experience changes in memory, attention, or thinking, but these do not automatically indicate a developmental condition. Persistent or worsening cognitive difficulties should be discussed with a healthcare professional so that their possible causes can be evaluated.
Can Appropriate Care Support Development?
Care depends on the individual's epilepsy, developmental needs, and underlying cause. When seizures contribute to learning or developmental difficulties, appropriate epilepsy management is an important part of care. If a developmental condition is also present, additional support may be useful, such as speech and language therapy, occupational therapy, educational adjustments, or developmental services.
For children, monitoring developmental progress during routine healthcare visits can help identify concerns early. Families should discuss persistent learning difficulties, delays in acquiring skills, changes in communication or behavior, or the loss of previously acquired abilities with the child's healthcare team. Depending on the findings, care may involve a neurologist, pediatrician, developmental specialist, genetic specialist, or other relevant professionals.
The key point is that epilepsy and developmental disorders can be linked, but their relationship is not the same for everyone. Understanding the timing of seizures, the person's developmental history, and any underlying neurological or genetic condition helps clinicians determine what may be contributing to the difficulties and what support is appropriate.