The intelligence of the human body has specially equipped the body to be under "constant" protection without which we would not survive today's world for very long.  Notice however, that some folks seem to be able to handle much greater amounts of stress or to be in stressful situations for longer periods without becoming ill or emotionally duressed.  This is because the complex and delicate hormone system is under the"direct" control of the master system of the body, the nervous system.

The autonomic nerves stimulate the release of the hormone adrenaline.  This is the body's response mechanism to stress and is also responsible for such actions as alleviating pain and affecting the circulation by the release of red blood cells.  The increased red blood cells increase energy by carrying oxygen to consume food substances.  The liver is also stimulated by this tiny adrenal gland to produce more sugar in order for the oxygen to have more fuel to burn.  These are just a few of the body's responses to stress.  As you can tell many complex reactions have to take place in order for us to be able to adapt to stressful situations.

Unfortunately, some of our simple daily routines or habits, such as sitting in chairs for lengthy periods, or riding in cars actually "cause" subtle stresses to our spines.  Eventually this adds up to the muscle tightening which you feel as tension.  This tension, which builds without release, will slowly move the spinal bones out of normal position,  This is known as a subluxation and causes interference to the nerve fibers which need to carry the important messages to the various glands.  These subluxations, therefore, prevent you from full protection for the dangers of stress.