Warren: So if you’re walking down a dark alley, you are probably thinking that there could be potential danger; that anxiety of anticipation, the feeling in your stomach, the elevated heart rate. But if you’re walking down that alley and somebody jumps out with a knife, then you’re likely to have a panic attack — an overwhelming urge to escape a situation that is dangerous.
Genetics and family history (e.g., parental anxiety) may predispose an individual for an increased risk of an anxiety disorder, but generally external stimuli will trigger its onset or exacerbation. Genetic differences account for about 43% of variance in panic disorder and 28% in generalized anxiety disorder. Although single genes are neither necessary nor sufficient for anxiety by themselves, several gene polymorphisms have been found to correlate with anxiety: PLXNA2, SERT, CRH, COMT and BDNF. Several of these genes influence neurotransmitters (such as serotonin and norepinephrine) and hormones (such as cortisol) which are implicated in anxiety. The epigenetic signature of at least one of these genes BDNF has also been associated with anxiety and specific patterns of neural activity.
2.This exposure happened either by directly experiencing the event(s), witnessing the event(s) in person, learning that the event(s) happened to a close friend or loved one (note: for cases of death or near death, it must have been violent or accidental), or being repeatedly exposed to the aversive details from traumatic events (e.g., as an emergency room doctor or nurse who frequently sees dead and mutilated bodies).
Medications — most often antidepressants and anti-anxiety drugs — can also be used to help treat panic disorder. Your doctor may initially prescribe you an anti-anxiety drug, such as Xanax (alprazolam), and then add an antidepressant, such as Effexor XR (venlafaxine). After a month or sooner, your doctor may stop the Xanax and have you remain on the antidepressant.
Approximately one-third of people with panic disorder will also develop agoraphobia. People with agoraphobia are afraid that they will have some anxiety symptoms or a full-blown panic attack in a place where it would be very challenging or embarrassing for them to flee. This condition can lead to avoidance behaviors, in which they try to stay away from all places or situations in which they may have a panic attack.
Furthermore, certain organic diseases may present with anxiety or symptoms that mimic anxiety. These disorders include certain endocrine diseases (hypo- and hyperthyroidism, hyperprolactinemia), metabolic disorders (diabetes), deficiency states (low levels of vitamin D, B2, B12, folic acid), gastrointestinal diseases (celiac disease, non-celiac gluten sensitivity, inflammatory bowel disease), heart diseases, blood diseases (anemia), cerebral vascular accidents (transient ischemic attack, stroke), and brain degenerative diseases (Parkinson's disease, dementia, multiple sclerosis, Huntington's disease), among others.
"This tends to make the individual vulnerable to developing an anxiety disorder, rather than cause them to directly inherit one," she says. Environmental factors, she adds, interact with genetic predispositions to trigger the onset of anxiety disorders. A study published in August 2017 in the journal Emotion may offer clues as to how both genes and environment combine to make anxiety take root. (4)
Occasional anxiety is an expected part of life. You might feel anxious when faced with a problem at work, before taking a test, or before making an important decision. But anxiety disorders involve more than temporary worry or fear. For a person with an anxiety disorder, the anxiety does not go away and can get worse over time. The symptoms can interfere with daily activities such as job performance, school work, and relationships.