Base on my learning on what I have read to the book the word stress is often used to describe external responses to them. Stress can be the result of trivial annoyances say for instances, driving in heavy traffic or a life-altering major crisis like the death of a loved one. Moderate levels of stress are thought to be good for you, stimulating the immune system and keeping your mind sharp. But high levels can cause you to become more susceptible to illness. It is thought that stress is a contributing factor in conditions such as ulcers, high blood pressure, asthma, and migraine.
There is even new evidence that suggests that too much stress can hasten the progression of chroinic degenerative diseases, such as rheumatoid arthritis. "Hidden stress" can be even more harmful to health because you are unlikely to address a problem that you don’t know exists.
