Is Anxiety Related to Your Genes? What is Anxiety? Anxiety is an emotion or a natural response to stress. It is a feeling of stress, unhappiness, fear or tension. If these feelings come and go normally, then it does not affect daily life, but if these feelings become excessive, then anxiety emotion converts into an anxiety disorder. Anxiety disorder is a common form of emotional disorder and it can affect anyone at any age. What are the Types of Anxiety