Caffeine activates the sympathetic nervous system by stimulating norepinephrine release, which triggers the body's fight-or-flight response, constricting blood vessels, increasing blood pressure, and raising heart rate in the short term (first 5 to 60 minutes).
causalpending
Evidence Quote
“what caffeine does is that it basically activates the body sympathetic nervous system by activating the release of norepinephrine no epinephrine is responsible for numb for what's what is called your body's fatal fight response so this is basically priming your body for action and what this does is that in the short term it constricts blood vessels when this increases your blood pressure and also raises your heart rate”
Created: 8/13/2026, 10:26:22 AM
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