HOW VAGUS NERVE STIMULATION WORKS

This form of treatment uses a mild electric current to stimulate a branch of the vagus nerve, which runs from the brain to vital organs such as the heart, lungs and digestive system. Previously implants in the chest would activate the nerve; modern devices use ear clips instead

The electric pulses can be targeted at the brain, to block the pain signals that cause headaches and boost chemicals to fight depression

The heart can also be targeted, tackling abnormal rhythms

Targeting the spleen stops it releasing proteins that cause painful, inflamed joints