"The US Food and Drug Administration (FDA) has approved a vagus nerve stimulator for rheumatoid arthritis " the first such device to be cleared for an autoimmune condition, potentially paving the way for broader uses.

The pill-sized device is surgically implanted along the vagus nerve " a bundle of nerve fibres connecting the brain to most vital organs " in the side of the neck.

For up to a decade, it then automatically delivers electrical pulses that stimulate the nerve and reduce inflammation."

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Ways to stimulate the vagus nerve