First we have our brain located in our skull. Then we have our Nervous System which is connected to our brain and spreads throughout our entire body through nerves that go through our spine. When we want the body to do something, such as a bodily function or action, the brain communicates to the corresponding nerve in our spine. For example, if you wanted to move your right arm to throw a ball, your brain would send a signal to the nerve that is connected to your right arm, and then your right arm would throw the ball.
But what happens when the brain is not able to communicate? We then have interference in our nervous system causing a lack of communication between the brain and body. When there is a problem between the communications, we have symptoms. Symptoms can be anything from pain, to a lack of movement, or even worse, disease. But what causes this interference? The answer is stress.