 SAD is sometimes referred to as an "illness of lost opportunities" where "individuals make major life choices to accommodate their illness".According to ICD-10 guidelines, the main diagnostic criteria of social anxiety disorder are fear of being the focus of attention, or fear of behaving in a way that will be embarrassing or humiliating, often coupled with avoidance and anxiety symptoms.Standardized rating scales can be used to screen for social anxiety disorder and measure the severity of anxiety.