Worry is a natural and inevitable part of life. At times anxiety can even serve as a means to motivate us to take action. However, the clusters of disorders that make up anxiety disorders are different due to their intensity and consistency. General Anxiety Disorder, which is quite common, is characterized by excessive worry about a variety of things. It can also cause irritability, muscle tension, impaired concentration and insomnia. Panic Disorder is characterized by intense physical symptoms that often manifest themselves without a precipitating factor. Many people initially end up in emergency rooms when they first undergo a panic attack as it can mimic symptoms of a heart attack. Symptoms include nausea, chest pain, palpitations, dizziness and a fear of losing control. Social anxiety disorder is characterized by an intense fear of being judged and humiliated by others. Phobias are an intense fear of an object or situation. Obsessive Compulsive Disorder (OCD) is characterized by uncontrollable recurring thoughts and accompanying compulsions or behaviors designed to relieve said thoughts.