Anxiety Disorders

In my post about panic disorder, I described fear as an emotion that elicits the "fight-or-flight" response of the autonomic nervous system. In anxiety, unlike fear, there is no activation of the fight-or-flight response. Anxiety is a long-term response oriented towards future events rather than imminent danger. Short-lived, low levels of anxiety can be good because they help prepare a person for upcoming activities such as an exam or sports event. However, long-term high-intensity anxiety creates a state of chronic over-arousal that can lead to physical troubles such as reduced immune response (i.e. susceptibility to disease) and increased blood pressure, as described in my post about the biological effects of stress.

Stress and Your Body: An introduction

Great Courses: Stress and Your Body, by Professor Robert Saplosky,
narrated by Robert Saplosky

Robert Saplosky is a professor of biological sciences, neurology, and neurosurgery at Stanford University. His lab focuses on how stress affects the nervous system. He also has extensive field work, studying a particular population of wild baboons in East Africa - where he examines how social rank, personality, and sociality affect vulnerability to stress-related disease. He is a fantastic lecturer, and if you get the chance to watch a YouTube video of him lecturing, go for it. 

Saplosky and The Teaching Company developed the course Stress and Your Body to teach us about the detrimental effects of stress on our health. The primary textbook is his own Why Don't Zebras Get Ulcers? Which, as far as I can tell from chapter 1 versus lecture 1, is pretty much verbatim with his lectures.  

The Biological Effects of Anxiety on the Body

Stress and anxiety can wreak havoc upon your body. It can lead to problems with childhood physical development, and affect the immune, endocrine, gastrointestinal, and cardiovascular systems. It can exacerbate diabetes. Stress affects the mind as well, a tragic example being PTSD, where an individual might relive a traumatic event over and over. 

Stress can be either good or bad event - such as marriage or a divorce. Low levels of stress can actually be a good thing - for instance, a small amount of stress might help you prepare for an upcoming exam better than you otherwise would have. But sometimes stress becomes overwhelming, and biological systems in your body that would usually only slightly increase during "good stress," go into overdrive - potentially on a long-term basis. 

Panic Disorder

Fear is an emotion that elicits the "fight-or-flight" response of the autonomic nervous system. It is an immediate (uncontrollable) response to a direct danger - such as a rattlesnake, a gun pointed at your head, or a fast car driving right at you. Fear is generally a helpful response that allows you to protect or remove yourself from the imminent peril. 

Sometimes the fear response can occur in the absence of any obvious stimulus - this can lead to a panic attack. Panic attacks are terrifying physiological and psychological events in which your autonomic nervous system ramps you up for fight-or-flight. Often, the person becomes terrified that they are dying - usually of a heart attack. Like intense fear, the heart starts pounding, adrenaline flows, breathing races. Sometimes the victim will run from the room - perhaps to a hospital or perhaps with no direction at all - to escape the unseen threat.