Although the environment we live in definitely has an effect on how people feel, it is important to consider the biological factors leading to social anxiety disorder (SAD). In particular, biologists Believe that SAD is related to a dysfunction of Brain Circuits responsible for regulating Emotions and the "Fight or Flight" response Center ( WebMD ). In particular, there is a brain structure called amygdala; it is known to play a role in controlling the fear response. If a person has an overactive amygdala, they often display an excessive "fear" type of emotional response; Therefore, Whenever a situation occurs that even slightly Uncomfortable Can be interpreted as, a person with SAD Will overreact in terms of Fear ( Mayo Clinic ). In addition, genetic factors should also be considered when studying the causes of SAD, because social anxiety may occur when it was also present in a first-degree relative: parent, sibling, or child.