Anxiety refers to a condition in which a person feels uneasy for a long time for no obvious reasons. The main anxiety disorders include Generalized Anxiety Disorder, Phobia, Panic attacks etc.
In Generalized Anxiety Disorder the person frequently experiences anxiety more intensely so that it starts interfering with the ability to perform daily tasks. Symptoms include irritability, headaches, insomnia, dizziness, breathlessness, etc.