Stress isn't just “feeling nervous” — it's a chain of biological responses that take place deep in your body and brain. To understand the effect, let's start with the role of stress hormones.

🧬 Stress hormones: cortisol, adrenaline & their effects

When your brain interprets that you are being threatened (physical or psychological), it becomes sympathetic nervous system activated (fight-or-flight). This triggers the production of adrenaline (epinephrine) and norepinephrine (norepinephrine), which provide:

  • Accelerated heart rate

  • Higher blood pressure

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