I can read about something scary, or watch a video where someone does something great for someone else, and immediately get chills up and down my arm. Why?
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You can thank your body’s endocrine system for that sudden, heightened sense of awareness. When triggered by your brain, your adrenal gland produces a hormone called adrenaline in response to unexpected feelings of fear, excitement, or anything that may thrill you in general (both in the positive and negative sense). This is your body’s cue to “bristle,” as your muscles contract in preparation to either fight or flee the source of your sudden thrill. Some people can’t seem to get enough of that feeling, and that’s why we call them adrenaline junkies.
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