What happens to your blood when you’re stressed? We put it to the test

By Lewis Fall, Senior Lecturer in Human Physiology, University of South Wales

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…

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