The amygdala is a small, almond-shaped structure in the brain that plays a key role in the processing of emotions, particularly fear and anxiety. It is part of the limbic system, which is a group of brain structures that are involved in emotional processing and behavior. The amygdala is involved in the initial emotional response to a stimulus, and it helps to activate the body’s fight-or-flight response in response to perceived threats. It is also involved in the formation of long-term emotional memories. Dysfunction of the amygdala has been linked to a number of mental health disorders, including anxiety disorders and post-traumatic stress disorder (PTSD).