The vagus nerve is getting a lot of attention right now because it sits at the crossroads of stress, inflammation, pain, mood, digestion, and heart health. People are trying to “hack” it. Some of that is good science. Some is hype. What the vagus nerve is It is the longest parasympathetic nerve in your body. It runs from your brainstem through your neck to your heart, lungs, gut, and other organs. It carries signals both ways, brain to body and body to brain. It helps slow h