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Health condition · Clinically reviewed

Guillain-Barré syndrome, rapid weakness, respiratory watch and specialist recovery.

A rare but urgent immune-mediated neuropathy. Prompt admission, IVIG or plasma exchange and specialist neurorehabilitation drive the best outcomes.

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Why trust this guide

  • 01

    Clinically reviewed

    Written by our editorial team and reviewed by a registered UK clinician before publication.

  • 02

    Sourced from guidance

    Checked against NICE, BSNM (British Society for Neuromuscular Medicine) and peer-reviewed neurology sources.

  • 03

    Current for 2026

    Reflects modern UK practice - IVIG or plasma exchange, respiratory monitoring and specialist neurorehabilitation.

Key facts

Guillain-Barré syndrome at a glance.

The essentials, in plain English - what it is, what causes it and how it is treated in the UK today.

  • What it is

    An acute immune-mediated polyradiculoneuropathy - the most common cause of acute flaccid paralysis in the developed world.

  • How common

    Around 1 to 2 cases per 100,000 people each year, with peaks in the young and the elderly and slightly more men than women.

  • Types

    AIDP (demyelinating, most common in the UK), AMAN (axonal, often post-Campylobacter), Miller-Fisher, pharyngeal-cervical-brachial and Bickerstaff variants.

  • Typical trigger

    A preceding infection one to three weeks earlier - Campylobacter jejuni in around 30 percent, plus influenza, EBV, CMV, HIV, Zika and rarely SARS-CoV-2 or vaccines.

  • What it does

    Progressive, symmetric, ascending weakness with areflexia - reaching a nadir within two to four weeks, then plateau and gradual recovery.

  • First-line treatment

    IVIG (0.4 g/kg for five days) or plasma exchange - both specialist commissioned and of equal efficacy. Steroids do not work.

Why this guide matters

A rare condition, but every hour counts.

GBS is uncommon, but recognising it early and acting fast changes outcomes. The three points below shape everything else on this page.

  • Rapid ascending weakness is a red flag

    Symmetric weakness spreading up the legs over hours or days, with lost reflexes, needs same-day neurology assessment.

  • Respiratory monitoring is non-negotiable

    Up to a quarter of patients need ventilatory support. Serial FVC and bulbar assessment guide safe timing of ICU care.

  • IVIG or plasma exchange - not steroids

    The two proven treatments are equally effective. Steroids do not work in GBS and are not recommended.

How the diagnosis is made

From first symptoms to a specialist plan.

The steps a UK acute team and specialist neurologist will normally follow - so you know what to expect and why each one matters.

  1. 01

    Assessing

    History and preceding illness

    Recent diarrhoeal or respiratory infection, vaccination or surgery in the past one to four weeks, plus the timing and progression of weakness.

  2. 02

    Assessing

    Neurological examination

    Power, tone, reflexes (typically absent), sensory levels, cranial nerves, bulbar function and autonomic signs - a full neuromuscular assessment.

  3. 03

    Assessing

    Respiratory function

    Serial forced vital capacity (FVC) and inspiratory capacity - specialist commissioned. Intubation is considered if FVC falls below 15 ml/kg or is dropping fast.

  4. 04

    Confirming

    Lumbar puncture

    Classic finding is albumin-cytological dissociation - raised CSF protein with a normal white cell count. May be normal in the first week.

  5. 05

    Confirming

    Nerve conduction studies + EMG

    Distinguishes demyelinating (AIDP) from axonal (AMAN) patterns and supports the diagnosis when clinical picture is uncertain.

  6. 06

    Confirming

    Serology and antibodies

    Campylobacter, EBV, CMV, HIV and Zika serology as indicated, plus anti-ganglioside antibodies - anti-GQ1b for Miller-Fisher syndrome.

  7. 07

    Escalating

    Admission and specialist neurology

    Any suspected GBS needs urgent hospital admission for observation, respiratory and autonomic monitoring and specialist neurology input.

Typical timeline: from first weakness to a specialist treatment plan in hours, not days.

Symptoms

What GBS actually looks like.

The classic ascending pattern, the variants that look different, and the features that mean it is time to escalate.

  • Ascending weakness

    Symmetric weakness that usually starts in the legs and moves upwards - progressing over hours to days.

  • Areflexia

    Loss of tendon reflexes in the affected limbs - one of the earliest and most reliable signs.

  • Paraesthesiae and pain

    Tingling, numbness and often severe neuropathic back or limb pain, sometimes before weakness appears.

  • Bulbar and facial weakness

    Difficulty swallowing, weak cough, facial droop and slurred speech - a signal to escalate care.

  • Respiratory involvement

    Shortness of breath, weak cough or falling FVC - up to a quarter of patients need ventilatory support.

  • Autonomic instability

    Arrhythmias, blood pressure swings, urinary retention and ileus - needs continuous monitoring.

  • Miller-Fisher triad

    Ophthalmoplegia, ataxia and areflexia - the classic variant, usually with anti-GQ1b antibodies.

  • Red flag - respiratory failure

    Falling FVC, weak cough or bulbar failure needs urgent ICU review and possible intubation.

Treatment

How GBS is treated in the UK.

IVIG or plasma exchange as first-line immunotherapy, with respiratory, autonomic and rehabilitation care around them - all specialist commissioned.

  • IVIG (intravenous immunoglobulin)

    First-line therapy at 0.4 g/kg per day for five days - specialist commissioned. Shortens time to recovery when started within two weeks of symptom onset.

  • Plasma exchange

    An alternative to IVIG with equal efficacy - specialist commissioned. Usually five sessions over one to two weeks. Not combined with IVIG.

  • Steroids

    Not effective in GBS - trials show no benefit, and they are not recommended by NICE or BSNM. Sometimes used in the chronic form (CIDP) instead.

  • Respiratory support

    Close monitoring of FVC and cough. Non-invasive ventilation or intubation and ICU care when respiratory muscles fail.

  • Autonomic and DVT care

    Cardiac monitoring for arrhythmia, blood pressure management and low-molecular-weight heparin for venous thromboembolism prophylaxis.

  • Pain and nutrition

    Neuropathic pain often needs gabapentin or amitriptyline. Swallowing may need NG or PEG feeding while bulbar weakness recovers.

  • Specialist neurorehabilitation

    A specialist commissioned neurorehabilitation programme - physiotherapy, occupational therapy, speech and language therapy and psychology. Often the biggest driver of long-term recovery.

  • Long-term monitoring

    Around 5 percent relapse, and a small number evolve into CIDP - both need ongoing specialist neurology follow-up.

What this guide is based on

The sources behind every claim on this page.

UK national guidance and specialist society 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 GP or neurologist knows your history and can tell you which parts apply to you. If GBS is suspected, seek emergency assessment straight away.

  • NICE. Guillain-Barré syndrome - clinical knowledge summary and specialist commissioning guidance.

  • British Society for Neuromuscular Medicine (BSNM). Guidance on the diagnosis and management of Guillain-Barré syndrome.

  • GAIN - Guillain-Barré + Associated Inflammatory Neuropathies UK. Patient and clinician resources.

  • European Academy of Neurology / Peripheral Nerve Society. Guideline on the management of GBS.

Red flags

When GBS needs urgent attention.

GBS is always urgent, but a handful of features raise the stakes further. These are the situations that call for the fastest response.

  • Rapidly falling FVC

    A dropping forced vital capacity - especially below 20 ml/kg - is a warning sign of imminent respiratory failure and needs ICU review.

  • Bulbar failure

    Weak swallow, weak cough or a wet voice risks aspiration - keep nil by mouth and involve anaesthetics and ICU early.

  • Autonomic collapse

    Wide swings in heart rate and blood pressure, new arrhythmias or unexplained cardiac arrest need continuous cardiac monitoring.

  • Fast progression

    Weakness worsening over hours rather than days - admit for urgent observation, even if current examination looks mild.

  • Miller-Fisher features

    Ophthalmoplegia, ataxia and areflexia - a distinct variant that still needs urgent neurology input and monitoring.

  • Bickerstaff brainstem encephalitis

    Drowsiness plus ophthalmoplegia and ataxia points to brainstem involvement - a neurological emergency.

  • Failure to improve or relapse

    No improvement after IVIG or plasma exchange, or worsening after initial recovery, may signal treatment-related fluctuation or evolving CIDP.

  • Severe neuropathic pain

    Disabling limb or back pain deserves prompt neuropathic pain management - it is a common but often under-treated feature.

  • Mental health impact

    Sudden paralysis and ICU care are traumatic - low mood, anxiety and PTSD symptoms deserve early psychological support.

Living with it

A long recovery, with real progress.

The acute phase can be frightening, but most people improve over months. Four things make the biggest difference along the way.

A quiet reminder

Rehab is the second half of the treatment.

The immunotherapy stops the attack. The rehabilitation - weeks and months of it - is what rebuilds strength, walking and confidence.

  1. 01 Recovery

    Recovery takes months, not weeks

    Most people improve over six to twelve months, and some for longer. Progress can feel slow but is usually steady.

  2. 02 Rehab

    Specialist rehabilitation matters

    Neurorehabilitation - physiotherapy, occupational therapy, speech therapy and psychology - is often the single biggest driver of long-term function.

  3. 03 Fatigue

    Pace yourself

    Post-GBS fatigue is real and common. Small, steady increases in activity beat pushing through and crashing.

  4. 04 Watch

    Know the relapse signs

    Around one in twenty people relapse, and a small number develop CIDP. New weakness or fresh paraesthesiae deserves a specialist review.

Frequently asked

Everything we get asked about Guillain-Barré syndrome.

Quick answers on triggers, diagnosis, IVIG, plasma exchange, respiratory care and recovery.

  • What is Guillain-Barré syndrome?

    It is an acute immune-mediated polyradiculoneuropathy - the immune system attacks peripheral nerves, causing rapidly progressive weakness and loss of reflexes. It is the most common cause of acute flaccid paralysis in the developed world and affects around one to two people per 100,000 each year.

  • What triggers GBS?

    A preceding infection one to three weeks earlier is common - Campylobacter jejuni is responsible for around 30 percent of cases, and influenza, EBV, CMV, HIV, Zika and (rarely) SARS-CoV-2 have all been linked. Surgery and, very rarely, vaccines can also precede it, but the individual risk from vaccination is extremely low.

  • How is GBS diagnosed?

    The diagnosis is clinical, supported by lumbar puncture (raised CSF protein with normal white cell count - albumin-cytological dissociation) and nerve conduction studies. Serology, MRI of the spine and anti-ganglioside antibodies (particularly anti-GQ1b for Miller-Fisher) are used selectively. Specialist neurology input is essential.

  • Why do people with GBS need respiratory monitoring?

    Up to a quarter of people need ventilatory support during the acute phase. Serial forced vital capacity and inspiratory capacity guide the decision. Intubation is considered when FVC falls below around 15 ml/kg or is dropping quickly, or when bulbar weakness threatens the airway.

  • What treatments actually work?

    IVIG (0.4 g/kg for five days) and plasma exchange are equally effective and are both specialist commissioned first-line options. Steroids do not work in GBS and are not recommended. Everything else - respiratory support, DVT prophylaxis, autonomic monitoring, pain and nutrition - is critical supportive care.

  • How much do people recover?

    Most people make a good recovery over six to twelve months, but a substantial minority are left with residual weakness, sensory symptoms or fatigue. Around 5 percent relapse and a small number develop CIDP. Specialist neurorehabilitation and long-term neurology follow-up make a real difference to outcomes.

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