Genetic risk factors have been documented for all anxiety disorders. Clinical genetic studies indicate that heritability estimates for anxiety disorders range from 30-67%. Many studies, past and present, have focused on identifying specific genetic factors that increase one's risk for an anxiety disorder. To date, an array of single nucleotide polymorphisms (SNPs) or small variations in genetic code, that confer heightened risk for anxiety have been discovered. For the most part, the variants that have been associated with risk for anxiety are located within genes that are critical for the expression and regulation of neurotransmitter systems or stress hormones.
Anxiety disorders differ from normal feelings of nervousness or anxiousness and involve excessive fear or anxiety. Anxiety disorders are the most common of mental disorders and affect more than 25 million Americans. But anxiety disorders are treatable and a number of effective treatments are available. Treatment helps most people lead normal productive lives.
Agoraphobia is the fear of being in situations where escape may be difficult or embarrassing, or help might not be available in the event of panic symptoms. The fear is out of proportion to the actual situation and lasts generally six months or more and causes problems in functioning. A person with agoraphobia experiences this fear in two or more of the following situations:
Until recently, panic disorder was not distinguished from agoraphobia (distressing anxiety resulting from being outside the home, travelling via public transit, being in open or claustrophobic environments, or being in crowds that generally leads to extreme avoidance due to fear of not being able to escape in those situations; APA, 2013). As it stands in the current Diagnostic and Statistical Manual of Mental Disorders - 5 agoraphobia is one of the most common disorders to co-occur with panic disorder. Current estimates contend that just under 2% of teens and adults have agoraphobia (Kessler et al., 2012). Often, people associate panic attacks or their panic disorder with certain places, people, or events and the fear of another attack occurring can lead to comorbid fears of the location or idea that there is no escape, which leads to extreme avoidance. Panic disorder can also occur simultaneously with other anxiety disorders, such as Generalized Anxiety Disorder (GAD) and/or Social Anxiety Disorder (SAD), for example.