Although there are not specific causes for panic attacks in adults, teens, or children, like most other emotional symptoms, panic is understood to be the result of a combination of biological vulnerabilities, ways of thinking, and environmental factors like social stressors. According to one theory of panic disorder, the body's normal "alarm system," also described as the body's fight or flight system, the set of mental and physical mechanisms that allows a person to respond to a threat, tends to be triggered when there is no danger. Scientists don't know specifically why this happens or why some people are more susceptible to the problem than others. Panic disorder has been found to run in families, and this may mean that inheritance (genetics) plays a role in determining who will develop the condition. However, many people who have no family history of the disorder develop it. Studies differ as to whether drugs like marijuana or nutritional deficiencies like zinc or magnesium deficiencies may also be risk factors for developing panic disorder.
Obsessive-compulsive Disorder (OCD): In OCD, a person becomes trapped in a pattern of repetitive thoughts and behaviors that are senseless and distressing but extremely difficult to overcome. Such rituals as counting, prolonged handwashing, and repeatedly checking for danger may occupy much of the person’s time and interfere with other activities. Like panic disorder, OCD can be treated effectively with medication and/or psychotherapy.
Agoraphobia is often comorbid with panic disorder — meaning people often suffer from both conditions at the same time. It's an intense fear of not being able to escape whatever place you're in, and can often lead to an avoidance of leaving the house. People with agoraphobia can fear situations where this anxiety might flare up, and typically don't feel comfortable or safe in public, crowded places.
Panic attacks are common among all anxiety disorders but what sets panic disorder apart is that panic attacks are unexpected and occur "out of the blue" without an obvious trigger (American Psychiatric Association, 2013; Craske & Barlow, 2007). These unexpected panic attacks must be associated with a significant change in behavior or be followed by at least one month of persistent worry about having another attack or about what will happen if you have another panic attack.