Anxiety is a normal & often considered a healthy emotion. However, when a person regularly feels high levels of anxiety, it might become a medical disorder. Anxiety disorders form a category of mental health diagnoses that lead to conditions like excessive nervousness, fear, apprehension, and worry. Mild anxiety might be vague and unsettling, while severe anxiety may seriously affect day-to-day living. types of anxiety disorders includes generalized anxiety disorder, social anxiety disorder (social phobia), specific phobias & separation anxiety disorder. A person can have more than one anxiety disorder.