Adrenaline
-The boss asks us as the last minute to give a complex presentation or the ones-associated with a thrill such as parachuting out of an aeroplane; it just releases a chemical called adrenaline

awareness = knowledge
These symptoms are unpleasant because they cause discomfort, but they can also be helpful, as we can use them to increase our awareness of the sources of anxiety.

burst = explosion

Exposure

immune system

Thrill = excitement

Vaccination

Alert

Chronic
And indeed, chronic stress is a proven cause of many major health problems such as heart disease and cancer.

Clinical