Anxiety disorder is a mental illness, not a psychological illness. Anxiety disorder is a neurological disorder in which anxiety is the main manifestation. The causes of the onset of anxiety disorder are mainly closely related to the quality of the organism and the environment it is in. From the medical point of view, mental illness is a disease in which the functional activities of the brain are disrupted under the influence of various biological, psychological and social environmental factors, resulting in different degrees of impairment in mental activities such as cognition, emotion, will and behavior. Psychological disorders are disorders that cause disorders of mental activity, resulting in disorders of perception, emotion, thinking, behavior, and volition, resulting in impaired attention, memory loss, etc. Anxiety disorders, on the other hand, are consistent with mental illnesses in terms of their onset, so they are mental illnesses, not psychological illnesses. Anxiety disorders are mainly characterized by excessive worry as the main symptom. In addition, there are feelings of tension and uneasiness, reactive sympathetic excitement, and somatization symptoms such as rapid heart rate, chest tightness, sweating, dry mouth, and pale face. Although anxiety disorders are not mental illnesses, mental illnesses and psychiatric illnesses can be transformed into each other. Some mental illnesses, such as pessimism, misanthropy, and lack of self-confidence when things go wrong, may lead to anxiety disorders or more serious mental illnesses if left untreated for a long time, so if you find yourself or others around you suspected of having a mental illness or psychiatric illness, you need to get treatment as soon as possible.