What is Guillain-Barré syndrome (GBS)?

Guillain-Barré syndrome (GBS) (say "ghee-YAN bah-RAY") is a rare nervous system disorder that results from nerve damage caused by the body's own defenses (immune system), usually in response to an infection or other illness. GBS causes muscle weakness, loss of reflexes, and numbness or tingling in the arms, legs, face, and other parts of the body. It may progress to complete paralysis. GBS is the most common medical cause of paralysis that develops over days to weeks.¹

Around 1 to 2 people out of every 100,000 develop GBS each year.² GBS affects males and females equally and occurs in all age groups, including children. Although GBS can be life-threatening, most people recover with few lasting problems.

What causes Guillain-Barré syndrome?

The exact cause of GBS is not known. However, it is believed that the disorder is an autoimmune disease, a condition in which the immune system attacks its own tissues as though they were foreign substances. Nerves are damaged by the immune system, usually in response to a viral or bacterial infection or other illness. As the immune system produces antibodies to fight the infection or illness, it may also produce antibodies that attack the covering (myelin sheath) of the peripheral nerves and sometimes the nerve fibers (axons). The resulting nerve damage leads to tingling and numbing sensations, muscle weakness, and paralysis.

Although it is not known exactly what triggers the body's response, GBS most often develops after a respiratory or gastrointestinal infection. A variety of infections may be associated with GBS. Those that have been most commonly linked to the disease are Campylobacter jejuni (a bacterial infection that affects the intestinal tract), mycoplasma (a type of bacteria that can cause pneumonia), cytomegalovirus (CMV), Epstein-Barr virus (EBV), and varicella-zoster virus, the virus that causes chickenpox and shingles.

The 1976 swine flu vaccine was linked to GBS. But since then, no clear links have been found between any flu vaccine and GBS. Getting the flu is much more of a health risk than is the chance that you could get GBS after having the flu vaccine.³

What are the symptoms?

Generally, symptoms of GBS include:

• Numbness or tingling in the hands and feet and occasionally around the mouth and lips.
• Muscle weakness on both sides of the body in the legs, arms, and face.
• Difficulty speaking, chewing, and swallowing.
• Inability to move the eyes.
• Back pain.

Symptoms usually start with numbness or tingling in the fingers and toes, followed by weakness in the leg and arm muscles that develops over a period of days to weeks. Hospital treatment is often needed during this time. The progression of weakness usually does not last longer than about 4 weeks. The weakness then stabilizes and gradually improves within the following few months.

How is Guillain-Barré syndrome diagnosed?