In the past, stressors were more physical, such as our body's response when we are in danger. In modern times, stressors are more subtle and intangible. Examples include constant change, uncertainty, hurrying, and of course the constant pressures of every-day living. Chronic stress and overload are linked to a whole host of diseases as well as premature aging. Once you understand stress, it will then be possible to develop a strategy to take advantage of the forces of change, master stress and make it work for you.
Stress is predictable.