We often encounter such patients, always feel uncomfortable, repeatedly to the hospital for examination, the test results are normal. The family says they think too much about it, the doctor says it’s anxiety, and the patient says I’m not anxious. So what is going on here? Did the doctor make a mistake? Or is the patient not aware of it? Is there really a disease that comes from thinking, so what is it? What is anxiety? What is anxiety disorder? How should we look at this phenomenon? From a psychological point of view, anxiety is a basic human emotion developed in the process of struggling with the environment and adapting to survive. Anxiety does not mean that all pathological emotions have clinical significance, but anxiety that adapts in the face of stress has a positive meaning, it can fully mobilize the skills of all organs of the body and moderately increase the reaction speed and alertness of the brain. It becomes pathological anxiety only when it possesses certain pathological features while having an impact on normal social functioning. Anxiety disorder is a neurological disorder that is mainly characterized by emotional anxiety and includes two clinical phases: acute anxiety and chronic anxiety, often accompanied by dizziness, chest tightness, palpitations, dyspnea, dry mouth, frequent urination, urinary urgency, sweating, tremor, and motor restlessness. Anxiety is not caused by actual danger and its tension is not proportional to the reality of the situation. The anxiety disorder mentioned here refers mainly to generalized anxiety disorder. The onset of anxiety disorders is closely related to the quality of the body and the environment in which it is located. Psychological factors also play an important role in the development of anxiety disorders. People who face long-term threats or are in an unfavorable environment are more likely to develop anxiety disorders. The pathogenesis of anxiety disorders is not completely clear, but the following advances have been made, related to genetics, neurobiological research focusing on the amygdala, in addition to some neurotransmitters, such as r-aminobutyric acid, norepinephrine, etc., and then there are psychological explanations. These are mainly psychological explanations, even though there are some neurobiological explanations that still make people feel that the disease is thought out. When it is said to be anxiety disorder, it is difficult for the patient to accept it. How do you understand anxiety, anxiety disorder, from a physiological point of view? If we consider the individual as a form of energy, the energy of a person as an isolated individual is relatively limited, and the nervous system as the bearer of energy mobilization and transportation, is also the main consumer. This is like a rubber band will start to rebound normally after the force, after a long time or too much force, the elastic retraction will be weakened, and the function will also be weakened. The nervous system is also different from the “rubber band under pressure”, it is in a working state, not only to complete the normal function, but also need energy to maintain its working state. Nervous tension is not the same as psychological tension, and psychological tension does not necessarily cause nervous tension. Any mental activity will consume energy. If the intensity and duration of anxiety is long and the energy consumed is more than the energy provided by the normal functional state of the nervous system, it will cause nervousness in the nervous system, which will bring various physical symptoms, but it is not necessarily anxiety that causes nervousness, but also other factors that cause nervousness. As long as the various factors that consume the body’s energy add up to more than the normal energy supply. So what are the factors? The human body’s physiological activities, which require basic energy, in addition to physical and mental activities, a single physical activity does not usually cause excessive consumption, but there are people who cause nervousness due to excessive physical activity for various reasons. More is the brain activity, brain activities consume energy is a certain hidden, active brain activities still have a certain degree of controllability, but passive brain activities, such as some event factors, because of the sudden occurrence of uncontrollable will bring energy consumption. Then there are individual illnesses, including some major physical diseases, which bring physical exertion and accompanying psychological reactions, which also bring energy consumption. Once these factors accumulate to cause nervous tension, their recovery takes time and effective methods. More people develop functional reactions or neurosis without realizing it. Our current explanation mostly uses psychological terms, so it sounds like a psychological problem. Thus, anxiety is not necessarily caused by anxiety, but anxiety is a factor in anxiety disorders, and for some patients, may be the most important factor. Anxiety has its physiological basis, and anxiety disorders should be considered more of a physiological problem. If a mental activity, there is no physiological reaction or somatic adverse feelings, would you still think it is a problem?