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Health condition

Niemann-Pick disease, the three types explained - and what specialist care looks like.

A rare inherited storage disorder that needs early recognition. Enzyme and genetic testing confirm the diagnosis, and a specialist metabolic team builds the plan from there.

Jump to treatment
A radiographer guides a patient onto the bed of an advanced 3 Tesla MRI scanner in a London imaging suite

Why trust this guide

  • 01

    Editorial team

    Written by our editorial team from the UK sources listed on each page.

  • 02

    Sourced from guidance

    Checked against NICE, NHS England specialist commissioning and peer-reviewed sources you can see at the end.

  • 03

    Current for 2026

    Reflects modern UK guidance including enzyme and genetic testing, miglustat therapy and specialist metabolic pathways.

Key facts

Niemann-Pick disease at a glance.

The essentials, in plain English - what it is, the types, and how it's approached in UK specialist care today.

  • What it is

    A group of rare inherited lysosomal storage disorders - types A and B from acid sphingomyelinase deficiency, type C from impaired cholesterol trafficking.

  • Inheritance

    Autosomal recessive - both parents carry a faulty gene copy, each child has a one-in-four chance of being affected.

  • Type A

    Severe infantile neurodegeneration - progressive and life-limiting, usually presenting before six months of age.

  • Type B

    Milder, mainly visceral disease - hepatosplenomegaly and lung involvement, often without significant neurological decline.

  • Type C

    Impaired cholesterol trafficking (NPC1 or NPC2 genes) - variable onset from infancy to adulthood, with progressive neurological features.

  • Treatment

    No cure - miglustat is licensed for type C to slow neurological progression, alongside supportive multidisciplinary care.

Why this guide matters

Early recognition changes what happens next.

Niemann-Pick disease is rare, but delayed diagnosis costs families time they cannot get back. The three points below shape everything else on this page.

  • The three types behave differently

    Types A, B and C have distinct causes, ages of onset and prognoses - getting the type right matters for planning and treatment.

  • A clear eye sign points to type C

    Vertical supranuclear gaze palsy is a distinctive clue that can shortcut the path to genetic testing and diagnosis.

  • Miglustat can change the trajectory

    For type C specifically, miglustat is licensed to slow neurological progression - an early conversation with genetics matters.

How the diagnosis is made

From first suspicion to a confirmed plan.

The steps a UK paediatrician, geneticist or metabolic specialist will normally follow, in order - so you know what to expect and why.

  1. 01

    Recognising

    Recognising the pattern

    Hepatosplenomegaly with developmental regression, poor feeding or ataxia in a child prompts consideration of a storage disorder.

  2. 02

    Recognising

    Vertical gaze assessment

    A vertical supranuclear gaze palsy - difficulty looking up or down - is a characteristic clue pointing towards type C.

  3. 03

    Recognising

    Specialist metabolic referral

    Suspected Niemann-Pick disease is referred promptly to a specialist metabolic or genetics service for coordinated work-up.

  4. 04

    Confirming

    Enzyme assay

    Acid sphingomyelinase activity is measured in blood cells to confirm or exclude types A and B.

  5. 05

    Confirming

    Genetic testing

    NPC1 and NPC2 gene sequencing confirms type C and clarifies carrier status for family planning.

  6. 06

    Planning

    MRI brain and organ imaging

    Brain MRI assesses neurological involvement while liver and spleen imaging quantifies organ enlargement and guides monitoring.

  7. 07

    Planning

    Multidisciplinary team planning

    A specialist commissioned metabolic disease MDT brings together neurology, hepatology, dietetics and genetic counselling around one plan.

Typical timeline: weeks from referral to confirmed diagnosis, though rare-disease pathways can take longer.

Symptoms

What Niemann-Pick disease actually looks like.

A mix of organ enlargement and neurological features that varies by type. And the features that mean it's time to escalate.

  • Hepatosplenomegaly

    Enlargement of the liver and spleen is often the first sign noticed, sometimes picked up incidentally on examination.

  • Developmental regression

    Loss of previously acquired skills - speech, movement or feeding - is a serious warning sign in infants and young children.

  • Vertical supranuclear gaze palsy

    Characteristic of type C - difficulty voluntarily moving the eyes up and down, often noticed as clumsy reading or stair descent.

  • Ataxia

    Unsteady, poorly coordinated movement and balance problems that tend to worsen gradually over time.

  • Poor feeding and failure to thrive

    Infants with severe forms may struggle to feed and gain weight, prompting early paediatric assessment.

  • Progressive neurological decline

    Seen in types A and C - cognitive, motor and speech function decline over months to years depending on severity.

  • Lung involvement

    Interstitial lung disease can occur, particularly in type B, sometimes causing breathlessness or recurrent chest infections.

  • Red flag - rapid infantile decline

    Rapid neurological deterioration in infancy needs urgent specialist metabolic assessment and family support.

Treatment

How Niemann-Pick disease is managed in the UK.

There is no cure - care is built around slowing progression where possible and supporting function, comfort and family wherever treatment sits.

  • Miglustat

    Licensed specifically for type C - a substrate reduction therapy shown to slow progression of neurological symptoms.

  • Physiotherapy

    Maintains mobility, prevents contractures and supports function as ataxia and motor decline progress.

  • Nutrition support

    Dietetic input, texture-modified diets or feeding tubes address swallowing difficulty and failure to thrive.

  • Seizure management

    Anti-epileptic medication is tailored to the seizure type, which can occur as neurological disease advances.

  • Speech and language therapy

    Supports communication and safe swallowing as bulbar function is affected by progressive disease.

  • Genetic counselling

    Explains inheritance risk, supports family planning decisions and coordinates testing for at-risk relatives.

  • Specialist metabolic MDT

    Coordinated input from neurology, hepatology, respiratory and dietetic teams under a single commissioned pathway.

  • Palliative care involvement

    Introduced early for severe infantile forms to focus on comfort, symptom control and family support.

What this guide is based on

The sources behind every claim on this page.

UK national guidance and specialist rare-disease standards, current at the time of last review.

Key references

Guidelines and standards we relied on.

A quiet reminder

This guide is for information, not medical advice.

Your specialist metabolic or genetics team knows your history and can tell you which parts apply to you. If in doubt, get seen.

  • NICE. Clinical knowledge summaries and referral pathways for suspected inherited metabolic disease.

  • NHS England. Specialised commissioning for lysosomal storage disorders.

  • Orphanet. Niemann-Pick disease types A, B and C - diagnostic and management guidance.

  • National Niemann-Pick Disease Foundation and UK patient support literature.

Red flags

When Niemann-Pick disease needs urgent attention.

Most ongoing care is planned and specialist-led. These are the situations that need urgent review outside the routine schedule.

  • Rapid infantile neurological decline

    Fast loss of motor and feeding skills in the first year of life is an emergency-level concern needing urgent specialist review.

  • Vertical gaze palsy in a child

    New difficulty looking up or down, especially with clumsiness or learning difficulty, should prompt referral for type C assessment.

  • Unexplained hepatosplenomegaly

    Enlarged liver and spleen without an obvious cause in a child warrants investigation for a storage disorder.

  • Failure to thrive with organ enlargement

    Poor weight gain alongside abdominal organ enlargement should not be dismissed as a feeding problem alone.

  • New seizures in known disease

    A first seizure in a patient with confirmed Niemann-Pick disease needs prompt neurological assessment.

  • Respiratory deterioration

    New breathlessness or recurrent chest infections, particularly in type B, need respiratory review for interstitial lung disease.

  • Severe swallowing difficulty

    Choking, coughing on food or recurrent aspiration needs urgent speech and language therapy input.

  • Family planning without counselling

    Siblings or relatives of an affected child planning a pregnancy should be offered genetic counselling before conceiving.

  • Psychological and family distress

    A life-limiting diagnosis carries a heavy emotional burden - low mood or family strain deserves proactive psychological support.

Living with it

A rare disease, with a coordinated team behind you.

Four things that make the biggest difference day to day - a strong specialist team, consistent monitoring, patient-group support and planning conversations early.

A quiet reminder

You are not expected to navigate this alone.

Specialist commissioned services and patient organisations exist precisely because rare disease care needs more than one clinician.

  1. 01 Team

    Build a specialist team early

    A commissioned metabolic disease MDT coordinates neurology, hepatology, dietetics and therapy so families are not managing this alone.

  2. 02 Monitor

    Keep monitoring consistent

    Regular MRI, organ imaging and functional assessment tracks progression and guides when therapy needs adjusting.

  3. 03 Support

    Lean on patient organisations

    National Niemann-Pick support groups connect families, share practical experience and help navigate services.

  4. 04 Plan

    Plan conversations early

    Genetic counselling and, where relevant, palliative care planning are easier to approach before a crisis than during one.

Frequently asked

Everything we get asked about Niemann-Pick disease.

Quick answers on the types, inheritance, testing and what treatment can and cannot do.

  • What is Niemann-Pick disease?

    A group of rare inherited lysosomal storage disorders. Types A and B result from acid sphingomyelinase deficiency, causing lipid build-up in the liver, spleen and, in type A, the brain. Type C results from impaired cholesterol trafficking due to NPC1 or NPC2 gene faults.

  • How is it inherited?

    Autosomal recessively. Both parents carry one faulty gene copy without symptoms themselves, and each pregnancy carries a one-in-four chance of an affected child. Genetic counselling helps families understand and plan around this risk.

  • What is the difference between the types?

    Type A causes severe infantile neurodegeneration and is life-limiting. Type B is generally milder, affecting mainly the liver, spleen and lungs with less neurological involvement. Type C has variable onset and progressive neurological decline, often with a characteristic vertical gaze palsy.

  • Is there a cure?

    No. There is no cure for any type. Miglustat is licensed specifically for type C and can slow neurological progression, while supportive care - physiotherapy, nutrition support and seizure management - addresses symptoms across all types.

  • How is it diagnosed?

    Types A and B are confirmed with an acid sphingomyelinase enzyme assay. Type C is confirmed through genetic testing of the NPC1 and NPC2 genes. MRI brain and liver or spleen imaging support the clinical picture, all coordinated through a specialist metabolic or genetics service.

  • What support is available for families?

    A specialist commissioned metabolic disease multidisciplinary team provides coordinated medical care, alongside genetic counselling for family planning. National patient organisations offer practical and emotional support, and palliative care teams are involved early for severe infantile forms.

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