Pain is an unpleasant feeling associated with actual or potential tissue damage and mediated by special nerve fibers to the brain where its conscious appreciation may be modified by various factors. Pain follows the bumps and bruises encountered in daily life, and all persons have experienced unpleasant but innocent headaches, sore throats, and muscle stitches. Pain that seems to originate in the chest generates far greater concern because it may announce the presence of severe, occasionally life-threatening disease. The new onset of chest pain and what it may connote provoke anxiety and fright; consequently, it is one of the symptoms most likely to cause the victim to seek prompt medical attention.