New research shows that chronic stress changes gene activity in immune cells before they reach the bloodstream. With these changes, the cells are primed to fight an infection or trauma that doesn’t actually exist, leading to an overabundance of the inflammation that is linked to many health problems. This is not just any stress, but repeated stress that triggers the sympathetic nervous system, commonly known as the fight-or-flight response, and stimulates the production of new blood cells.
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