Stress
Tension is a killer. ~ Verbal Kent (Kaiser Soze) in the movie The Usual Suspects (1995)
Stress is an organism’s sustained response to a stimulus, either environmentally or internally produced. Stress is a dysfunctional form of emotional memory.
There is no such thing as positive stress. Stress is the source of all self-induced maladies. Pathogens are the only other source of disease.
The greatest weapon against stress is our ability to choose one thought over another. ~ American physician, psychologist, and philosopher William James