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.
If you're having lots of panic attacks at unpredictable times and there doesn't seem to be a particular trigger or cause, you might be given a diagnosis of panic disorder. It's common to experience panic disorder and agoraphobia (a type of phobia) together. People who experience panic disorder may have some periods with few or no panic attacks, but have lots at other times.
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.
Obsessive-compulsive disorder (OCD) is characterized by unwanted thoughts or behaviors that seem impossible to stop or control. If you have OCD, you may be troubled by obsessions, such as a recurring worry that you forgot to turn off the oven or that you might hurt someone. You may also suffer from uncontrollable compulsions, such as washing your hands over and over.
There has been recent interest in using psychoactive substances in conjunction with psychotherapy; the two that have received increased attention have been cannabis (marijuana) and methylenedioxymethamfetamine (MDMA, known as ecstasy or molly). These drugs are somewhat controversial, given that they also have psychoactive, i.e. "feeling high" effects. However, with increasing legalization of marijuana it is important to address whether these substances could be used to alleviate clinical symptoms of anxiety. While there have been only a few randomized clinical trials for these drugs, certain forms of cannabis have demonstrated positive effects on anxiety. Specifically, cannabidiol, a component of cannabis has been effective for Social Anxiety Disoder, and tetrahydrocannabinol (THC) has helped PTSD patients. However, the plant form of cannabis has not shown great efficacy and has potential to worsen symptoms, so should be used with caution and only under supervision of a provider. MDMA has shown some positive effects for PTSD, but should only be used as an adjunct to psychotherapy, again under clinical care.
While the term "test anxiety" refers specifically to students,[29] many workers share the same experience with regard to their career or profession. The fear of failing at a task and being negatively evaluated for failure can have a similarly negative effect on the adult.[30] Management of test anxiety focuses on achieving relaxation and developing mechanisms to manage anxiety.[29]
Psychodynamic theory posits that anxiety is often the result of opposing unconscious wishes or fears that manifest via maladaptive defense mechanisms (such as suppression, repression, anticipation, regression, somatization, passive aggression, dissociation) that develop to adapt to problems with early objects (e.g., caregivers) and empathic failures in childhood. For example, persistent parental discouragement of anger may result in repression/suppression of angry feelings which manifests as gastrointestinal distress (somatization) when provoked by another while the anger remains unconscious and outside the individual's awareness. Such conflicts can be targets for successful treatment with psychodynamic therapy. While psychodynamic therapy tends to explore the underlying roots of anxiety, cognitive behavioral therapy has also been shown to be a successful treatment for anxiety by altering irrational thoughts and unwanted behaviors.

In people with anxiety disorders, the brain circuitry that controls the threat response goes awry. At the heart of the circuit is the amygdala, a structure that flags incoming signals as worrisome and communicates with other parts of the brain to put the body on alert for danger. Early life events, especially traumatic ones, can program the circuitry so that it is oversensitive and sends out alarms too frequently and with only minor provocations. Survival mandates a system for perceiving threats and taking quick, automatic action, but those with anxiety see threats where there are none, perhaps because emotional memories color their perceptions.
Heredity, other biological factors, stressful life events, and thinking in a way that exaggerates relatively normal bodily reactions are all believed to play a role in the onset of panic disorder. Some research suggests panic attacks occur when a “suffocation alarm mechanism” in the brain is activated, falsely reporting that death is imminent. The exact cause or causes of panic disorder are unknown and are the subject of intense scientific investigation.
But some think that nature isn’t as much of an influence as nurture. People theorize that women tend to be socialized in a way that gives them permission to openly discuss emotion. So women may feel more comfortable admitting to feelings than men, who tend to be socialized to keep their feelings to themselves and are less likely to confess to emotional problems. Women may therefore get diagnosed with anxiety disorders more often than men. (9)
Furthermore, certain organic diseases may present with anxiety or symptoms that mimic anxiety.[6][7] These disorders include certain endocrine diseases (hypo- and hyperthyroidism, hyperprolactinemia),[7][73] metabolic disorders (diabetes),[7][74][75] deficiency states (low levels of vitamin D, B2, B12, folic acid),[7] gastrointestinal diseases (celiac disease, non-celiac gluten sensitivity, inflammatory bowel disease),[76][77][78] heart diseases, blood diseases (anemia),[7] cerebral vascular accidents (transient ischemic attack, stroke),[7] and brain degenerative diseases (Parkinson's disease, dementia, multiple sclerosis, Huntington's disease), among others.[7][79][80][81]
Additionally, there is some evidence that Acceptance and Commitment Therapy (ACT), Mindfulness-based Stress Reduction treatment (MBSR), as well as online and computerized treatments are effective in treating panic disorder (Arch et al., 2017). However, the overwhelming majority of research supports the long-term success of CBT for treating panic disorder. More research is needed to explore the extent to which MBSR and ACT work when compared to CBT and other treatments, but preliminary results are positive. In general, empirically-supported treatments that are founded on the basis of research within the psychological and medical fields are recommended for treating panic disorder.

Carbonell compares the type of breathing you’ll need with the breathing of infants, whose bellies rise and fall with each inhale and exhale. When an anxiety attack starts, exhale deeply, loosen your shoulders, and focus on some longer, deeper inhales and exhales that let your belly rise and fall. Place one hand on your belly if you need to feel this happening.

Seek medical follow-up. For those who are diagnosed with panic disorder, depression, or another form of anxiety disorder, the news is encouraging when treatment is received. These disorders are usually well controlled with medications. However, many people suffer the effects of these illnesses for years before coming to a doctor for evaluation. These conditions can be extremely disabling, so follow-up after the initial visit to the doctor is crucial so that diagnosis and treatment can continue.

Although beta-blockers are most often used to treat high blood pressure, they can also be used to help relieve the physical symptoms of anxiety, such as rapid heartbeat, shaking, trembling, and blushing. These medications, when taken for a short period of time, can help people keep physical symptoms under control. They can also be used “as needed” to reduce acute anxiety, including as a preventive intervention for some predictable forms of performance anxieties.