The avoidance behaviors associated with agoraphobia can greatly restrict a person’s life. People with agoraphobia often develop groups of feared situations that are related. For example, many people with agoraphobia become extremely upset and uncomfortable in areas where there are many people in a confined space. This fear may limit them from standing in line at a store, going to a movie theater, or traveling on an airplane. Other commonly feared situations for people with agoraphobia include forms of travel, being alone, and open spaces. These fears may result in an inability to even leave their homes.
^ Eley, Thalia C.; McAdams, Tom A.; Rijsdijk, Fruhling V.; Lichtenstein, Paul; Narusyte, Jurgita; Reiss, David; Spotts, Erica L.; Ganiban, Jody M.; Neiderhiser, Jenae M. (July 2015). "The Intergenerational Transmission of Anxiety: A Children-of-Twins Study". American Journal of Psychiatry. 172 (7): 630–637. doi:10.1176/appi.ajp.2015.14070818. ISSN 0002-953X.
Research upon adolescents who as infants had been highly apprehensive, vigilant, and fearful finds that their nucleus accumbens is more sensitive than that in other people when deciding to make an action that determined whether they received a reward. This suggests a link between circuits responsible for fear and also reward in anxious people. As researchers note, "a sense of 'responsibility', or self-agency, in a context of uncertainty (probabilistic outcomes) drives the neural system underlying appetitive motivation (i.e., nucleus accumbens) more strongly in temperamentally inhibited than noninhibited adolescents".
An anxiety or panic attack often comes on suddenly, with symptoms peaking within 10 minutes. For doctors to diagnose a panic attack, they look for at least four of the following signs: sweating, trembling, shortness of breath, a choking sensation, chest pain, nausea, dizziness, fear of losing your mind, fear of dying, feeling hot or cold, numbness or tingling, a racing heart (heart palpitations), and feeling unusually detached from yourself.
The degree of accompanying stress response and its physiological, psychological, and emotional changes are directly proportional to the degree of anxiety. For example, if you are only slightly concerned, such as being slightly nervous about meeting someone new, the body produces a small degree stress response. The small degree stress response can be so slight that you don’t even notice it.