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Living with Cryptogenic late-onset epileptic spasms

A rare epilepsy syndrome with clusters of seizures called spasms that start after age 1.

Understanding Cryptogenic late-onset epileptic spasms

Cryptogenic late-onset epileptic spasms is a rare epilepsy syndrome with clusters of epileptic spasms that start after 1 year of age.

The spasms come in clusters and are linked with other seizure types (tonic seizures and atypical absences) and a decline in thinking skills. Language difficulties and behavior problems are frequent. Brain wave tests (EEG) show a typical pattern. It starts in childhood.

Signs & symptoms

GARD doesn't list a symptom list for this condition. Its summary mentions these:

  • Clusters of epileptic spasms
  • Tonic seizures and atypical absences
  • Decline in thinking skills
  • Language difficulties
  • Behavior problems

Not everyone has every symptom. GARD's list comes from the Human Phenotype Ontology.

Diagnosis

  1. Talk with your doctor

    Share the symptoms you've noticed, when they started and your family health history. Notes and photos can help.

  2. See a specialist

    Specialists who may be involved include brain and nervous system specialists, genetic specialists and seizure and epilepsy specialists.

  3. Ask which tests can help

    Your care team will decide which exams and tests can confirm the diagnosis.

  4. Connect with expert centers

    Epilepsy Foundation may keep lists of experts for this condition.

Care & treatment

Care team
Brain and nervous system specialists (neurologists); Genetic specialists (geneticists); Seizure and epilepsy specialists (epileptologist)
Expert care
Expert lists: Epilepsy Foundation
Treatment
GARD doesn't list specific treatments for this condition. Your care team will tailor care to your symptoms.
Research
Clinical trials and observational studies may be options. See the research section below.

General information, not medical advice. Your care team makes the decisions.

Everyday life

Living with a rare condition is easier with support.

  • Connect with Epilepsy Foundation and other patient organizations
  • Keep notes on symptoms, changes and questions for appointments
  • Ask about patient registries that help research
  • Look into financial aid and travel resources for care visits
Bring these questions to your next doctor visit
Which seizure medicines or treatments might help?
What do the EEG results show for my child?
What support is there for language and behavior?

Quick facts

Symptoms usually startChild

GARD says changes in genes cause this condition. It doesn't name a gene. Cryptogenic means no cause was found.

GeneticNeurological

Also known as: late-onset infantile spasms

Patient organizations

Source: NIH GARD · Cryptogenic late-onset epileptic spasmsGARD ID 20050 · GARD page updated September 2026 · Plain-language summary by Know Rare; editorial review pending. General information, not medical advice.

You are more than your diagnosis

Perspectives from people navigating life with Cryptogenic late-onset epileptic spasms.

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