Two areas of the amygdala generate reactions. The lateral nucleus processes the sensory information associated with anxiety—hearing a strange sound, say, or not being able to see clearly—and the central nucleus (upon being activated by the stimulus) sends a signal to the motor system to “freeze.” It also triggers the release of stress hormones, affecting the autonomic nervous system, which regulates breathing, heart rate, and blood pressure. The result of all this activity is to feel anxious, says Dr. LeDoux, who is also director of the Emotional Brain Institute at NYU.
Most Autoimmune system Diseases occur because of the Mental Stress that affects our CNS (Central Nervous System).

