GBS is a nerve disease that affects senses, movements, breathing, and heartbeat in humans. The condition, in which the body’s immune system attacks nerves, can cause paralysis and even death.

Department of Neurology, The Royal Hallamshire Hospital, Glossop Road, Sheffield, S10 2JF, UK Correspondence to: Dr M Hadjivassiliou, Department of Neurology, The ...

The slow development of symptoms leads many patients to adapt to declining health without noticing the underlying deficiency, Shelley warned. She noted: "The most common symptom of a vitamin B12 ...