The fifth edition of the Diagnostic and Statistical Manual of Mental Disorders (DSM-5) lists several types of anxiety disorders. The common thread among these disorders is that they all involve excessive fear or worry, along with certain behavioral changes related to these distressing emotions. 

The following are among the more common types of anxiety disorders:

• Generalized anxiety disorder (GAD): This is the disorder that many people think of when they hear the word “anxiety.” Symptoms of GAD include difficulty concentrating or focusing, muscle tension, restlessness, insomnia, and fatigue.
• Panic disorder: Panic disorder is a mental health condition that can cause a variety of painful physical symptoms. Those who have panic disorder may experience the sudden onset of symptoms such as racing heart rate, chest pain, difficulty breathing, dizziness, and nausea. Panic attacks can cause people to believe that they are about to die.
• Social anxiety disorder: People who have social anxiety disorder will experience overwhelming fear when they are in situations where they may be viewed or judged by others. Symptoms of this disorder, which is sometimes referred to a social phobia, may be brought about by circumstances such as public speaking, eating in restaurants, and meeting new people. 
• Specific phobia: This type of anxiety disorder is characterized by intense, immediate fear related to a specific item, animal, or experience. Common triggers for symptoms of specific phobia include needles, spiders, and flying in a plane.
• Agoraphobia: Agoraphobia symptoms can be brought on by certain environments. People who have agoraphobia may experience considerable distress when they are outside their homes, in wide open locations, in a confined space, or in a crowd.