Panic attacks may also be caused by substances. Discontinuation or marked reduction in the dose of a substance such as a drug (drug withdrawal), for example an antidepressant (antidepressant discontinuation syndrome), can cause a panic attack. According to the Harvard Mental Health Letter, "the most commonly reported side effects of smoking marijuana are anxiety and panic attacks. Studies report that about 20% to 30% of recreational users experience such problems after smoking marijuana."[16]
While the use of drugs in treating panic attacks can be very successful, it is generally recommended that people also be in some form of therapy, such as cognitive behavioral therapy. Drug treatments are usually used throughout the duration of panic attack symptoms, and discontinued after the patient has been free of symptoms for at least six months. It is usually safest to withdraw from these drugs gradually while undergoing therapy.[14] While drug treatment seems promising for children and adolescents, they are at an increased risk of suicide while taking these medications and their well-being should be monitored closely.[59]
Great questions. Unfortunately, there is usually no clear cut answer – and like many mental health disorders – it is likely caused by a combination of genetic, behavioral, and developmental factors. Anatomically speaking, Generalized Anxiety Disorder is most closely related to a disruption in the functional connectivity of the amygdala – the “emotional control center” of the brain – and how it processes feelings of fear and anxiety. Genetics also play a role in Generalized Anxiety Disorder. If you have a family member that also suffers from this disorder, your chances of suffering from it are increased, especially in the presence of a life stressor. Interestingly, long-term substance abuse also increases your chances of Generalized Anxiety Disorder, as the use of benzodiazepines can worsen your anxiety levels, as can excessive alcohol use. Tobacco use and caffeine are also both associated with increased levels of anxiety.
Expected panic attacks are those which occur when you are exposed to one of your triggers. For example, if you have a fear of flying you may have a panic attack when you board a plane. Expected panic attacks are again broken down into two categories: situationally bound (cued) in which a person is anticipating exposure to a particular trigger (as with our flying example), or situationally predisposed, in which a panic attack does not always occur when exposed to the feared situation.
A condition in which parting with objects (e.g., household items or personal possessions) causes significant distress. In addition, many individuals continuously acquire new things and experience distress if they are not able to do so. The inability to discard possessions can make living spaces nearly unusable. Relatedly, the cluttered living space can interfere with the performance of daily tasks, such as personal hygiene, cooking, and sleeping (e.g., the shower is full of stuff, the bed is covered with clutter).

Demographic factors also impact risk for anxiety disorders. While there is not a strong consensus, research suggests that risk for anxiety disorders decreases over the lifespan with lower risk being demonstrated later in life. Women are significantly more likely to experience anxiety disorders. Another robust biological and sociodemographic risk factor for anxiety disorders is gender, as women are twice as likely as men to suffer from anxiety. Overall symptom severity has also been shown to be more severe in women compared to men, and women with anxiety disorders typically report a lower quality of life than men. This sex difference in the prevalence and severity of anxiety disorders that puts women at a disadvantage over men is not specific to anxiety disorders, but is also found in depression and other stress-related adverse health outcomes (i.e. obesity and cardiometabolic disease). Basic science and clinical studies suggest that ovarian hormones, such as estrogen and progesterone, and their fluctuations may play an important role in this sex difference in anxiety disorder prevalence and severity. While changes in estrogen and progesterone, over the month as well as over the lifetime, are linked to change in anxiety symptom severity and have been shown to impact systems implicated in the etiology of anxiety disorders (i.e. the stress axis), it still remains unclear how these hormones and their fluctuations increase women's vulnerability to anxiety.

Although breathing into a paper bag was a common recommendation for short-term treatment of symptoms of an acute panic attack,[45] it has been criticized as inferior to measured breathing, potentially worsening the panic attack and possibly reducing needed blood oxygen.[46][47] While the paper bag technique increases needed carbon dioxide and so reduces symptoms, it may excessively lower oxygen levels in the blood stream.
Hyperventilation syndrome may occur when a person breathes from the chest, which can lead to overbreathing (exhaling excessive carbon dioxide in relation to the amount of oxygen in one's bloodstream). Hyperventilation syndrome can cause respiratory alkalosis and hypocapnia. This syndrome often involves prominent mouth breathing as well. This causes a cluster of symptoms, including rapid heart beat, dizziness, and lightheadedness, which can trigger panic attacks.[12]
Medication does not cure anxiety disorders but can help relieve symptoms. Medication for anxiety is prescribed by doctors, such as a psychiatrist or primary care provider. Some states also allow psychologists who have received specialized training to prescribe psychiatric medications. The most common classes of medications used to combat anxiety disorders are anti-anxiety drugs (such as benzodiazepines), antidepressants, and beta-blockers.