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A healthy immune system remains in homeostasis (balance), much like the speeding up and slowing down relationship between the sympathetic and parasympathetic nervous systems that we described previously in the section of this document concerned with the fight-or-flight response.
Because of this similarity, the immune system has sometimes been called our "liquid nervous system." Stress causes these cells and organs that compose the nervous system to release hormones that trigger the production of white blood cells (which fight infection) and other disease-fighting elements.
However, this activity is not beneficial to your health if it continues for more than a short while.
After stressors (such as injury or illness) have been dealt with, the immune system normally secretes additional hormones that trigger a decrease in the production of white blood cells, enabling the system to rest and rejuvenate itself.
This normal decrease and rejuvenation response becomes delayed during times of chronic stress.
Chronic stress may also alternatively cause people to lose their appetite and to lose too much weight.
Cardiovascular system Chronic activation of stress hormones can raise your heart rate, cause chest pain and/or heart palpitations (sensations that your heart is pounding or racing), and increase your blood pressure and blood lipid (fat) levels.Stress and Illnesses Because of their effects on the immune system, as described above, stress hormones impact the development and severity of many different diseases and bodily systems.