We have all heard it: "It's just in your head." When work deadlines pile up, financial worries linger or an unexpected public speaking obligation looms, we often treat anxiety as a purely psychological challenge – something to be overcome with a bit of willpower. But our bodies don't separate the psychological from the physical. Your brain is not an island, and anxiety does not stay trapped between your ears. It triggers a rapid cascade of biochemical changes that travel through the bloodstream