Anxiety is a common non-psychotic mental symptom, patients feel very painful, even painful, and affect their social function. The performance of day-to-day panic, fear, always feel that there will be misfortune or disaster, but can not say why. In severe anxiety can also appear finger tremor, muscle tension, fidgeting, walking back and forth, rubbing hands and feet, as well as dizziness, stiff neck and so on. However, anxiety is not only a common psychiatric symptom, but also a common reactive manifestation, i.e. a response to an event or situation. Anxiety alone also has a positive effect in that it can be a motivator in life, something we all experience. Psychological research has shown that anxiety, although a distressing experience, has important adaptive functions. The first is a signaling function (“alert” function), which signals danger to the individual, and when this signal appears in consciousness, people can take effective measures to deal with the danger, either to avoid it or to try to eliminate it. Anxiety alerts people to the existence of internal or external dangers and plays a protective role in their lives. Only when there is no reason for it, and one cannot understand why one is so frightened and severely anxious, is it pathological. The second is the mobilization of the organism in a state of combat readiness. When anxiety occurs, the organs innervated by the autonomic nerves enter a state of excitement, alertness increases, blood circulation is accelerated, metabolism is elevated, and appropriate preparations are made for taking action against the danger. The third participates in the process of learning and experience accumulation. Anxiety helps people to improve their ability to anticipate danger, helps people to continuously adjust their behavior, and learn methods and strategies to cope with adverse emotions. Some scholars believe that a typical anxiety disorder must have: 1, anxious state of mind. 2, motor restlessness and autonomic disorders (including dry mouth, sweating, palpitations, chest tightness, body heat or coldness, redness or whiteness of the face, loss of appetite, diarrhea or constipation, urinary urgency and frequency, etc.), or else it cannot be diagnosed as an anxiety disorder. And as an anxiety symptom, it is not necessary to have the above symptoms. When both of these are present, it is important to seek medical attention!