An anxiety threshold is the level of anxiety that, when reached, can affect a person's performance. Anxiety is an emotion, similar to fear, that can be created by insecurities in one’s abilities, concerns for the future, such as financial or situational circumstances, or past memories of frightening experiences. Anxiety can affect all age groups and if fears are irrational, it may cause mental disorders. An individual's anxiety threshold can be measured by the amount of anxiety consistently manifested from situation to situation. Sub-threshold anxiety traits can be mild, atypical, or masked and therefore present a negative result for tests such as the Diagnostic and Statistical Manual of Mental Disorders (DSM). These sub-threshold symptoms are therefore often overlooked as early signs of more serious anxiety disorders. Social anxiety disorder is one of the most frequent anxiety disorders. Both threshold and sub-threshold social anxiety disorders are associated with a higher risk for many other disorders. Anxiety sensitivity is a characteristic that can be described as the fear of anxiety. Anxiety sensitivity is an integral factor in the development and maintenance of anxiety. A panic attack can be induced when an anxiety threshold is reached.