Intellectual Disability

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Intellectual Disability

Medically reviewed · Ratel Health editorial team · Sunday, 16 August 2026

A neurodevelopmental condition involving deficits in intellectual functioning and adaptive functioning that begin during the developmental period.

Overview

Intellectual disability involves deficits in intellectual functioning, such as reasoning and problem-solving, along with deficits in adaptive functioning that limit independence in daily life, with onset during the developmental period.

Signs and Symptoms

Signs can include delays in reaching developmental milestones, difficulty with academic or practical skills, and challenges with independent daily living relative to same-age peers. Experiencing one or more of these symptoms does not necessarily mean that a person has this condition. Diagnosis requires an appropriate clinical evaluation.

Causes and Risk Factors

Causes can include genetic conditions, prenatal exposures, birth complications, or early childhood illness or injury; in many cases the exact cause is not identified.

Diagnosis

A diagnosis should be made by a qualified healthcare professional following a comprehensive clinical assessment. Clinicians may use established diagnostic frameworks such as DSM-5-TR and/or ICD-11 as part of a comprehensive assessment.

Treatment

Treatment depends on the individual’s symptoms, clinical history, severity, age, co-occurring conditions, and other relevant factors.

Psychotherapy

Early intervention services, special education support, and skills-based therapies may help maximize functioning and independence.

Living With Intellectual Disability

Individualized support plans tailored to specific strengths and needs can significantly improve quality of life.

When to Seek Professional Help

Professional evaluation may be appropriate if symptoms persist, worsen, cause significant distress, or interfere with work, school, or relationships.

Outlook

With appropriate support, many individuals with intellectual disability achieve meaningful independence; needs and abilities vary widely.

Related Conditions

Autism Spectrum Disorder

A neurodevelopmental condition involving differences in social communication and interaction, along with restricted or repetitive behaviors and interests.

Global Developmental Delay

A diagnosis given to young children who show significant delays in two or more developmental domains, when standardized testing is not yet feasible.

Specific Learning Disorder

A neurodevelopmental condition involving persistent difficulties learning key academic skills, such as reading, writing, or math, despite appropriate instruction.

Medical Information Disclaimer

Ratel Health provides general educational information and does not provide medical diagnosis, treatment, or individualized medical advice. Information on this page is not a substitute for evaluation or care from a qualified healthcare professional. Do not use this information to diagnose yourself or another person, or to start, stop, or change treatment or medication without consulting an appropriately qualified healthcare professional.

References

  • American Psychiatric Association. Diagnostic and Statistical Manual of Mental Disorders, Fifth Edition, Text Revision (DSM-5-TR).
  • National Institute of Mental Health.
  • World Health Organization. International Classification of Diseases, 11th Revision.