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.

Ubrelvy and Nurtec are prescription medications taken to treat migraines. Though they share similarities, Ubrelvy is for acute treatment, while Nurtec can be taken for immediate symptom relief.

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 ...