The sympathetic nervous system was thought to have evolved with jawed vertebrates. But lampreys—jawless, parasitic fish that suck out the blood of their hosts—have a simple one, per recent research.

A heart attack activates stress circuits in the brain that evolved for survival but can amplify inflammation, disrupt healing ...

Salk Institute scientists discovered a relationship between killer T cell exhaustion and the body’s sympathetic—“fight-or-flight”—stress response. The research showed that beta-blockers could inhibit ...

Bolls explained that sympathetic arousal is the reaction from your sympathetic nervous system, which controls the “flight or fight” response to danger. While Bolls and his team are still looking ...