Anxiety disorders are the most common and pervasive mental health disorders. They are real, serious medical conditions—just as real and serious as physical disorders like heart disease or diabetes. Anxiety disorders differ from normal feelings of nervousness or anxiousness, and involve excessive fear or anxiety. To be diagnosed with an anxiety disorder, the fear or anxiety must (1) be out of proportion to the situation or age inappropriate; (2) hinder your ability to function normally. There are several types of anxiety disorders, including generalized anxiety disorder, panic disorder, and phobias. What they all have in common is crippling anxiety.