Depression and Anxiety Disorders: Diagnosis and TreatmentAbout This Hardback A group of mental disorders categorized by significant feelings of anxiety and fear are known as anxiety disorders. Anxiety is an emotion in which a person feels an unpleasant state of inner turmoil. Fear is a feeling caused by perceived danger or threat. These feelings can cause physical symptoms such as a fast heart rate and shakiness. The cause of anxiety disorders is a combination of environmental and genetic factors. It can