Biological Perspective: In this theory, it is believed that some people are born much more sensitive to stimulation and stress than others. People born with extra-sensitive temperaments are prone to and are at greater risk of developing anxiety disorders later in life because their nervous system is more easily aroused. 

Cognitive Perspective: The cognitive theory asserts that anxiety is related to overestimating the negative aspects of interaction and underestimating the positive aspects. It is believed that anxiety is merely the pattern of thoughts leading people to avoid certain situations. 

Behavioral Perspective: Similar to the cognitive theory, the behavioral perspective is the physical manifestation of thoughts and fears about the ability to manage circumstances. 

Psychodynamic Perspective: This concept is mainly learned in psychology and its main idea is that our behavior and feelings are influenced by unconscious motives, meaning behaviors and feelings, such as anxiety we have as adults, are rooted in our childhood and that anxiety has a cause. In this theory, it is also believed that personality is shaped as what drives anxiety modifies conflicts.

Humanistic Perspective: Humanistic Perspective begins with the assumption that people have free will. With this idea in mind, the humanistic approach emphasizes that people have the ability to control whether they have anxiety or not whereas the person can simply decide to have anxiety and choose to apply it to different situations if they want to.

Community-Cultural Perspective: The cultural perspective revolves around culture, race, and ethnicity. Anxiety would be the fear of negative evaluation by other which is where social standards and role expectations fall. In this theory, it is believed that anxiety is cultural dependency meaning people develop anxiety because of the constant fear of not being accepted by a social standard and based on our perception of social norms. 

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I hope this helps ^ω^