There are many types of anxiety disorders depending on your group of symptoms. They include: Social Anxiety Disorder, Post-Traumatic Stress Disorder, Panic Disorder with or without Agoraphobia, Obsessive-Compulsive Disorder, Specific Phobia, Generalized Anxiety Disorder, and Separation Anxiety (in children and youth).
Definitions below are from the Canadian Mental Health Association:
Panic Disorder — As the name suggests, panic disorder is expressed in panic attacks which occur without warning, accompanied by sudden feelings of terror. Physically, an attack may cause chest pain, heart palpitations, shortness of breath, dizziness, abdominal discomfort, feelings of unreality and/or a fear of dying. When a person avoids situations that he or she fears may cause a panic attack, his or her condition is described as panic disorder with agoraphobia.
Phobias — Phobias are divided into two categories: Social Phobia, which involves fear of social situations, and Specific Phobias, such as fear of flying, blood or heights.
Social Phobia — People with social phobia feel a paralysing, irrational self-consciousness about social situations. They have an intense fear of being observed or of doing something horribly wrong in front of other people. The feelings are so extreme that people with social phobia tend to avoid objects or situations that might stimulate that fear, which dramatically reduces their ability to lead a normal life.
Specific Phobias — Fear of flying, fear of heights and fear of open spaces are some typical specific phobias. People suffering from a specific phobia are overwhelmed by unreasonable fears which they are unable to control. Exposure to feared situations can cause them extreme anxiety and panic, even if they recognize that their fears are illogical.
Post-Traumatic Stress Disorder — Having a terrifying experience or event in which serious physical harm occurred or was threatened can cause post-traumatic stress disorder. Survivors of rape, child abuse, war or a natural disaster may develop post-traumatic stress disorder. Common symptoms include flashbacks (during which the person re-lives the terrifying experience), nightmares, depression and feelings of anger or irritability.
Obsessive-Compulsive Disorder — This is a condition in which people suffer from persistent, unwanted thoughts (obsessions) and/or rituals (compulsions) which they find impossible to control. Typically, obsessions concern contamination, doubting (such as worrying that the iron hasn’t been turned off) and disturbing sexual or religious thoughts. Compulsions include washing, checking, organizing and counting.
Generalized Anxiety Disorder — Characterized by repeated, exaggerated worry about routine life events and activities, this disorder lasts at least six months, during which time the person is affected by extreme worry on more days than not. The individual anticipates the worst, even if others would say they have no reason to expect it. Physical symptoms can include nausea, trembling fatigue, muscle tension, or headache.