This document discusses different types of anxiety disorders, including anxiety, fear, panic attacks, generalized anxiety disorder, and agoraphobia. It describes the key characteristics of anxiety as a negative affect involving somatic tension and future-oriented worrying. Fear is defined as a strong sympathetic nervous system response to present danger. Panic attacks can be situationally bound, unexpected, or situationally predisposed. The document presents models of the causes of different anxiety disorders, showing how biological and psychological vulnerabilities can interact with stress, life events, and learned associations to trigger anxiety, fear, and panic.