Stress:

Stress is not necessarily a bad thing; it can be a stimulus for positive change & growth.  But excess stress can be detrimental.  Research shows that as stress builds, you may become more susceptible to physical illness, mental & emotional problems & accidental injuries.  Stress affects your body through the nervous system, which is the control center of your body.  Every thought, action and emotion reflects the activity of the nervous system.  The nervous system is also responsible for the stress related "fight or flight" response.  Here's how it works; let's say that during a back-country hike, an angry cougar confronts you.  You have two choices; run or fight.  Your body prepares for action, your muscles tense, your heart rate, breathing and blood pressure all increase.  Your liver dumps sugar into your blood stream for energy and your adrenal glands pump adrenaline into your system.  Your body also shuts down digestion, the kidneys and reproductive system, which are not needed for immediate survival.