Many children experience anxiety at different times in the course of their development. They may be anxious about whether they will fit in with peers, an upcoming school presentation, or why they got a bad grade on a homework assignment. A little anxiety can serve as a protective mechanism in helping the child be vigilant to stressful or chaotic situations. It also helps motivate the child to prepare for difficult or challenging situations, especially those involving performance expectations. This chapter will focus on more extreme forms of anxiety that negatively affect the child’s ability to function and derail the sense of self.