What causes Guillain-Barré syndrome?

It is an autoimmune reaction in which the immune system attacks the peripheral nerves, usually a few weeks after an infection such as a stomach bug or respiratory illness. The precise cause is not fully known.

How fast does GBS come on?

Quickly. Numbness, tingling and weakness typically start in the feet and legs and spread upward over days to a few weeks, usually worsening most over the first 2 to 4 weeks.

Why is GBS dangerous?

In severe cases it can weaken the muscles used for breathing and swallowing, which can be life-threatening and may need intensive care and a ventilator — so it must be treated urgently in hospital.

Do people recover from GBS?

Most people recover, with many able to walk within about six months and recover within a year, though it can take longer and some have lasting effects such as weakness, numbness or fatigue.

Guillain-Barré Syndrome (GBS): Symptoms & Treatment (Singapore)

Q: How is GBS treated?

In hospital, with immunotherapy — either intravenous immunoglobulin (IVIG) or plasma exchange — plus supportive care and breathing support if required.

Written & reviewed by the BestDoctors.sg editorial team · Last updated 1 Sep 2026 · General information, not medical advice

Quick answer. Guillain-Barré syndrome (GBS) is a rare but serious condition in which the immune system mistakenly attacks the peripheral nerves, often a few weeks after an infection – commonly a gut or respiratory infection. It typically causes rapidly developing numbness, tingling and weakness that usually starts in the feet and legs and spreads upward, often on both sides, over days to a few weeks. In severe cases it can weaken the muscles used for breathing and swallowing, which is a medical emergency needing hospital and sometimes intensive care. It is treated with immunotherapy – intravenous immunoglobulin (IVIG) or plasma exchange – plus supportive care. Most people recover, though it can take months.

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In a medical emergency, or for severe or sudden symptoms such as breathing difficulty, chest pain, fainting or stroke signs, call 995 immediately.

GBS can start mildly and worsen quickly, which is why it needs urgent assessment even in its early stages. The reassuring news is that most people recover well with prompt hospital treatment.

Medical emergency – act now. Rapidly worsening or spreading weakness or numbness – especially with any difficulty breathing, swallowing or speaking – is a medical emergency. Call 995 or go to the nearest A&E immediately. Do not wait to see whether it settles. Early treatment and close monitoring can be life-saving, because GBS can affect the muscles used for breathing over a short time.

What it is

Guillain-Barré syndrome is a rare condition in which the immune system, instead of only fighting an infection, mistakenly attacks the body’s own peripheral nerves – the nerves that run outside the brain and spinal cord and carry signals to and from the muscles, skin and internal organs. When these nerves are damaged, the messages between the nerves and the muscles are disrupted. This is why the main feature is weakness, usually alongside altered sensation such as tingling or numbness.

The weakness often starts in the feet and legs and spreads upward towards the arms and upper body, frequently on both sides. GBS is regarded as a medical emergency because it can progress quickly and, in severe cases, weaken the muscles used for breathing and swallowing. The important thing to hold onto is that most people recover, although recovery can take time and needs proper hospital care. Because the early stages can look mild, GBS should always be assessed urgently rather than watched at home.

Symptoms

Symptoms often begin with tingling and numbness in the hands and feet, followed by muscle weakness. The pattern is typically an ascending one – weakness that spreads upward and worsens over hours to days – and it commonly affects both sides of the body fairly evenly. Common features include:

Tingling, “pins and needles” or numbness, often starting in the feet and hands
Progressive muscle weakness that may spread upward and worsen quickly
Unsteadiness and difficulty walking, or a tendency to trip or feel the legs give way
Nerve pain, aching or cramping, sometimes in the back or limbs
Facial weakness, difficulty with speech, swallowing or chewing
Double vision or difficulty moving the eyes
In more severe cases, trouble breathing, and problems with heart rate or blood pressure

The most serious symptoms – difficulty breathing, swallowing or speaking – point to weakness of the muscles that keep the airway safe and move air in and out of the lungs. These need emergency attention without delay. Changes in heart rate or blood pressure can occur because GBS may also affect the nerves that control automatic body functions.

Causes and triggers

In many people, GBS follows an infection – commonly a gut (stomach) infection or a flu-like, respiratory illness – that happened a few weeks earlier. The current understanding is that, while responding to that infection, the immune system mistakenly turns against the body’s own peripheral nerves. It is not contagious: you cannot catch GBS from another person, and it is not passed on through families in the way inherited conditions are.

Anyone can be affected, at any age and in either sex, although it is uncommon. The exact reasons why one person develops GBS after an infection while most others do not are not fully understood, and in some cases no clear trigger is ever found. Importantly, nothing the person did causes GBS – it is not the result of lifestyle, diet or stress.

How it is diagnosed

GBS needs urgent assessment, usually in hospital through the Emergency Department. A doctor – often a neurologist – makes the diagnosis mainly from the history and a careful examination, looking for the characteristic pattern of spreading weakness and reduced or absent reflexes. Because the condition can change quickly, part of the assessment is close, repeated monitoring of breathing and swallowing, so that any worsening is picked up early.

Tests that help confirm the diagnosis and rule out other causes include:

Nerve conduction studies – measuring how well and how quickly the nerves carry electrical signals to the muscles
A lumbar puncture (spinal tap) – a needle is used to take a small sample of the fluid that surrounds the brain and spinal cord, which can show changes typical of GBS
Blood tests and, at times, other scans to exclude conditions that can look similar

Alongside these tests, the care team keeps a close watch on the strength of the breathing muscles and the safety of swallowing, because these guide how urgently treatment and extra support are needed. In Singapore, complex nerve conditions may be managed with input from a specialist centre such as the National Neuroscience Institute (NNI).

Treatment

GBS is treated in hospital, and people are often looked after in a high-dependency or intensive care setting so that breathing, swallowing, heart rate and blood pressure can be monitored closely and any deterioration managed quickly. Treatment has two aims: to calm the immune attack on the nerves, and to support the body and prevent complications while the nerves recover.

The specific treatments that dampen the immune attack are:

Immunoglobulin given into a vein (intravenous immunoglobulin) – a preparation of antibodies that helps settle the harmful immune response
Plasma exchange – a procedure that filters the blood to remove the antibodies that are attacking the nerves

These are generally regarded as similarly effective, and the choice depends on the person’s situation and what is available. Supportive care is just as important, and may include support for breathing – up to and including a ventilator if the breathing muscles become weak – careful management of swallowing and nutrition, pain relief, and steps to prevent complications such as blood clots, pressure sores and chest infections during a period of reduced movement. Starting treatment and monitoring early is a major reason why outcomes are usually good.

Recovery and rehabilitation

Recovery from GBS is often gradual, over weeks to months. The nerves heal slowly, so improvement tends to be steady rather than sudden, and hospital stays can be lengthy, particularly when breathing support has been needed. Physiotherapy and rehabilitation play a central role – rebuilding strength, balance and walking, protecting the joints while muscles are weak, and helping people return to daily activities at a safe pace. Occupational therapy, speech and swallowing therapy, and other allied health input may also be part of the plan.

Many people recover well, though the picture varies. Some are left with lasting effects such as ongoing numbness, nerve pain, tiredness or weakness, which may need continued support and follow-up. Because a serious illness and a slow recovery can be frightening and exhausting, emotional support matters – from family, from the care team, and sometimes from patient support groups, including a Guillain-Barré syndrome support community in Singapore. Reliable general health information is also available through HealthHub.

When to seek emergency help

Trust any sign that the condition is moving quickly. Call 995 or go to the nearest A&E immediately if you or someone else has:

Rapidly worsening or spreading weakness or numbness – especially if it is climbing up the body
Any difficulty breathing, shortness of breath, or a weak or breathless voice
Any difficulty swallowing, speaking or clearing saliva, or choking on food or drink
Increasing difficulty walking, standing or using the arms
Fainting, or a racing, slow or irregular heartbeat

Rapidly worsening or spreading weakness or numbness – especially with any difficulty breathing, swallowing or speaking – is a medical emergency. Do not wait to see if it improves. Early treatment and monitoring can be life-saving. If you are worried but symptoms are milder, still seek urgent medical advice the same day, as GBS can change quickly.

Is Guillain-Barré syndrome contagious?

No. GBS itself cannot be passed from person to person. It is an immune reaction that sometimes follows an infection, but the syndrome is not something you can catch from someone who has it.

Does everyone with GBS need intensive care?

No. Severity varies a great deal. Some people have a milder illness, while others need high-dependency or intensive care, particularly if the breathing or swallowing muscles are affected. Everyone needs urgent hospital assessment and close monitoring, because the condition can worsen quickly.

Can GBS come back?

For most people GBS is a single illness and does not return, though recovery can be slow. A doctor or neurologist can explain your own outlook and arrange follow-up and rehabilitation as needed.

Related brain & nerve conditions

Sources

NHS — Guillain-Barré syndrome.
HealthXchange / National Neuroscience Institute (NNI), Singapore — GBS doctor Q&A.
National Neuroscience Institute (NNI), Singapore — patient support groups.

General information only. This guide is general information about a brain or nerve condition and is not a diagnosis or personalised medical advice. See a doctor — a GP or a neurologist — for assessment, tests and treatment. Call 995 for stroke symptoms (face drooping, arm weakness, slurred speech), a sudden severe “worst-ever” headache, a first or prolonged seizure, or a rapidly worsening loss of movement, consciousness or breathing.

Guillain-Barré Syndrome (GBS) in Singapore