The feeling of episodic anxiety occurs in all people and is normal. Acute stress serves to mobilize vitality and is even beneficial to health. Anxiety disorder is a pathological condition in which anxiety is a symptom that violates the quality of life. So people with anxiety disorders feel a pronounced constant anxiety or fear, regardless of the importance of life situations. Even a small problem in such patients or even the thought of such a problem can lead to the development of uncontrolled anxiety. In some patients, the feeling of anxiety and fear is sudden, intense, accompanied by a pronounced autonomic symptomatology. Such episodes of pathological fear or anxiety are called panic attacks. Patients with anxiety disorders have a reduced quality of life, they can not control feelings of anxiety, tension. In addition, anxiety disorders can last for months and years. In many patients, anxiety disorder begins in childhood or adolescence and lasts, then increases, then decreases, throughout life. Some patients try to avoid places or situations that can provoke a panic attack.