An excessive adrenaline response can lead to severe anxiety symptoms, such as seen in a panic attack. The excessive adrenaline release into the bloodstream, coupled with the activation of the sympathetic nervous system from the fight or flight response, can induce multiple physical anxiety symptoms such as racing heartbeat, pounding chest, shortness of breath, sweating, nausea, vomiting, tunnel vision, lump in the throat, butterflies in the stomach, voice quivering, muscle tension, and trembling.
