So, if anxiety has so many negative effects, why is it relatively common? Many scientists who study anxiety disorders believe that many of the symptoms of anxiety (e.g., being easily startled, worrying about having enough resources) helped humans survive under harsh and dangerous conditions. For instance, being afraid of a snake and having a "fight or flight" response is most likely a good idea! It can keep you from being injured or even killed. When humans lived in hunter-gatherer societies and couldn't pick up their next meal at a grocery store or drive-through, it was useful to worry about where the next meal, or food for the winter, would come from. Similarly avoiding an area because you know there might be a bear would keep you alive —worry can serve to motivate behaviors that help you survive. But in modern society, these anxiety-related responses often occur in response to events or concerns that are not linked to survival. For example, seeing a bear in the zoo does not put you at any physical risk, and how well-liked you are at work does not impact your health or safety. In short, most experts believe that anxiety works by taking responses that are appropriate when there are real risks to your physical wellbeing (e.g., a predator or a gun), and then activating those responses when there is no imminent physical risk (e.g., when you are safe at home or work).
There are long-term, biological, environmental, and social causes of panic attacks. In 1993, Fava et al. proposed a staging method of understanding the origins of disorders. The first stage in developing a disorder involves predisposing factors, such as genetics, personality, and a lack of wellbeing.[11] Panic disorder often occurs in early adulthood, although it may appear at any age. It occurs more frequently in women and more often in people with above-average intelligence. Various twin studies where one identical twin has an anxiety disorder have reported a 31–88% incidence of the other twin also having an anxiety disorder diagnosis.[12]

I don’t know if I’m having anxiety attacks but every time I face a minor problem in my life, even if it us really stupid, I feel like I want to cry, to scream, and it’s like something is blocking my throat. I can’t control my anger during those moments, so I usually turn off my phone so I don’t say things I don’t mean to my friends or my family when I’m panicking and overthinking about any minor situation.

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]
Fear and anxiety are part of life. You may feel anxious before you take a test or walk down a dark street. This kind of anxiety is useful - it can make you more alert or careful. It usually ends soon after you are out of the situation that caused it. But for millions of people in the United States, the anxiety does not go away, and gets worse over time. They may have chest pains or nightmares. They may even be afraid to leave home. These people have anxiety disorders. Types include
Psychologically, people who develop panic attacks or another anxiety disorder are more likely to have a history of what is called anxiety sensitivity. Anxiety sensitivity is the tendency for a person to fear that anxiety-related bodily sensations (like brief chest pain or stomach upset) have dire personal consequences (for example, believing that it automatically means their heart will stop or they will throw up, respectively). From a social standpoint, a risk factor for developing panic disorder as an adolescent or adult is a history of being physically or sexually abused as a child. This is even more the case for panic disorder when compared to other anxiety disorders. Often, the first attacks are triggered by physical illnesses, another major life stress, or perhaps medications that increase activity in the part of the brain involved in fear reactions.
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.
Not getting enough restful sleep can trigger anxiety. Stress and anxiety can also interfere with sleep and cause you to stay awake at night. It can be a frustrating cycle when the stressors of the day and future worries cause you stay up at night. Take some time to wind down before bed such as utilizing some of the above relaxation and meditation strategies. Also, instead of letting your mind continuously race at night, try putting your thoughts, worries, and plans for the next day on paper before bed. This will ease your anxiety about forgetting something you need to accomplish in the future and allow you to relax and rest.

Only 16, Caroline, had her first panic attack a year ago. Her mother was dropping her off at her summer job at a local school when, without warning, a full-blown panic attack engulfed her. “My heart started racing and my body felt so hot. I started to sweat and shake uncontrollably. My vision became distorted and my body felt limp, like a wet noodle,” she says. For 20 minutes, until the panic attacked passed, Caroline refused to get out of the car. Her mother didn’t know what to do.
Not everyone understands is that someone with an anxiety disorder cannot "just let things go". This makes the struggle with an anxiety disorder even harder, and may prevent one from looking for help. However, it is very important to talk about these anxieties with someone and preferably find a health care professional as soon as you experience these symptoms. Anxiety should be considered as severe as a physical disease; however, most people in society do not appreciate the severity of this disorder. Some people may consider anxiety a fault or a weakness; however, it may help if people realize that many research studies have demonstrated biological explanations for (some of) the symptoms observed in anxiety disorders. Brain scans have demonstrated brain abnormalities in certain anxiety disorders, and also altered brain functioning has been demonstrated for individuals with anxiety disorders. Furthermore, there is some evidence that anxiety disorders might be linked to chemical imbalances in the brain.
In the central nervous system (CNS), the major mediators of the symptoms of anxiety disorders appear to be norepinephrine, serotonin, dopamine, and gamma-aminobutyric acid (GABA). Other neurotransmitters and peptides, such as corticotropin-releasing factor, may be involved. Peripherally, the autonomic nervous system, especially the sympathetic nervous system, mediates many of the symptoms. Increased flow in the right parahippocampal region and reduced serotonin type 1A receptor binding in the anterior and posterior cingulate and raphe of patients are the diagnostic factors for prevalence of anxiety disorder.
Butterflies in your stomach before an important event? Worried about how you will meet a deadline? Nervous about a medical or dental procedure? If so, you are like most people, for whom some worry about major events (like having a child, taking an exam, or buying a house), and/or practical issues (like money or health conditions), is a normal part of life. Similarly, it is not uncommon to have fears about certain things (like spiders, injections, or heights) that cause you to feel some fear, worry, and/or apprehension. For example, many people get startled and feel nervous when they see a snake or a large insect. People can differ in what causes them to feel anxious, but almost everyone experiences some anxiety in the course of their life.
Carbonell says that understanding the physiology of fainting and reminding yourself of it is important. People faint when their blood pressure drops. A anxiety attack can make you feel like you’re going to faint, but you won’t because your blood pressure doesn't drop during an attack. Remind yourself out loud of truths like these to counter your fears.
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.

Selective mutism: A somewhat rare disorder associated with anxiety is selective mutism. Selective mutism occurs when people fail to speak in specific social situations despite having normal language skills. Selective mutism usually occurs before the age of 5 and is often associated with extreme shyness, fear of social embarrassment, compulsive traits, withdrawal, clinging behavior, and temper tantrums. People diagnosed with selective mutism are often also diagnosed with other anxiety disorders.