Drinking excessive amounts of caffeine triggers the release of adrenaline, which is the primary source of a fight - or - flight response. (inc.com)
Drinking excessive amounts of caffeine triggers the release of adrenaline, and adrenaline is the source of the fight - or - flight response. (entrepreneur.com)
This can also be accentuated if you consume excessive amounts of caffeine and some drugs. (healthcare-online.org)