⚠️ In UK clinical practice, the term learning disability refers to global cognitive impairment, not isolated academic problems. Conditions such as dyslexia or dyscalculia are instead classified as Specific Learning Difficulties (SpLDs). 🌟 Early identification and supportive interventions significantly improve long-term outcomes.

🧬 Causes and Risk Factors

Intellectual disability results from disruption of normal brain development. Causes may be genetic, prenatal, perinatal, or acquired in childhood.

Genetic syndromes
- Down syndrome (Trisomy 21)
- Fragile X syndrome – most common inherited cause
- Williams syndrome
- Prader–Willi syndrome
- Angelman syndrome
- Tuberous sclerosis
Chromosomal abnormalities
- Microdeletions or duplications (e.g. 22q11 deletion syndrome)
Prenatal causes
- Maternal alcohol use (fetal alcohol spectrum disorder)
- Congenital infections (e.g. CMV, toxoplasmosis, rubella)
- Severe maternal malnutrition
Perinatal causes
- Prematurity
- Hypoxic–ischaemic brain injury
- Birth trauma
Childhood causes
- Meningitis or encephalitis
- Severe head injury
- Lead poisoning
- Epileptic encephalopathies

📊 Severity of Intellectual Disability

Severity	Typical Features
Mild	Most common (~85%) May achieve independent living with support Difficulties mainly with academic learning
Moderate	Noticeable developmental delay Requires support for daily living Basic communication usually present
Severe	Marked cognitive and communication impairment Requires significant assistance with daily activities
Profound	Very limited communication Dependent on others for care Often associated with neurological or physical disability

🔍 Clinical Features

👶 Children	👩 Adults
Delayed speech and language development. Delayed motor milestones. Difficulty learning basic academic skills. Problems with social communication. Need for additional educational support.	Difficulty living independently. Challenges with employment or financial management. Increased vulnerability to exploitation or abuse. Higher rates of mental and physical health problems.

🧪 Diagnosis

Developmental history including milestones and school performance.
Cognitive assessment using standardised IQ testing.
Adaptive functioning assessment (daily living skills).
Medical evaluation including hearing and vision testing.
Genetic testing if a syndromic cause is suspected.

🎯 Management

Management aims to maximise independence, quality of life, and health outcomes. Care is typically multidisciplinary.

📘 Educational and Social Support

Education, Health and Care Plan (EHCP) where appropriate.
Special educational provision.
Assistive technology and communication aids.
Support for independent living and employment.

🧠 Psychological Support

Adapted cognitive behavioural therapy.
Behavioural interventions.
Support for families and carers.

💊 Medical Care

Treatment of associated conditions (e.g. epilepsy, ADHD).
Regular health monitoring.
Vision and hearing correction.
Annual health checks for adults with learning disability.

📈 Prognosis

Intellectual disability is lifelong, but many individuals lead fulfilling lives with appropriate support. Early intervention, inclusive education, and coordinated healthcare services are key to improving long-term outcomes.

✅ Key Point

Learning disability (intellectual disability) involves global impairment in cognitive and adaptive functioning. It is distinct from specific learning difficulties such as dyslexia, which affect particular academic skills but occur in people with normal intelligence.

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Learning (Intellectual) disability