When a person encounters an adverse emotional stimulus (medically called adverse life event), regardless of how the event is caused, there is always some kind of psychological stress, which is called “stress response” in psychology. When a life event occurs, the psychological stress response causes changes in cortical function, which affects the limbic system and causes pathological changes in the endocrine activity of the pituitary gland. At the beginning of the psychological stress response, the secretion of adrenocorticotropic hormone, growth hormone, and prolactin increases and rapidly reaches its peak, and then rapidly drops below the normal baseline (the psychological denial period) and is maintained for a considerable period of time. It is this change that causes pathogenic changes in human psychology and physiology. If this change reaches a certain level and exceeds the body’s ability to regulate it, a disorder of psychological equilibrium and a disruption of brain function can occur, leading to mental illness. In psychiatric outpatient and counseling work, doctors often encounter people who show obvious psychiatric symptoms but fail to draw the attention of their families and colleagues. These people are much easier to cure if they receive early psychiatric treatment than if their symptoms develop in the future. Early treatment of illnesses and early prevention of illnesses are especially important for patients with psychiatric abnormalities. Early treatment of mental illnesses is not only effective, but can also eliminate some unsafe risk factors and prevent problems before they occur. So how to early detection of mental abnormalities, can be observed from the following aspects: 1, personality changes: personality has become different from the usual, such as a calm and introverted people, suddenly become “extroverted”, excited talk, unreasonable, for a little insignificant small matter on the temper. Or the usual lively and extroverted people become “introverted”, silent, do not interact with others. Or suspicious, thinking that people around him are not happy with him, and when he sees someone talking, he suspects that he is talking about himself. 2, mood and emotional changes: Mood changes in psychiatric patients are often unexplained, even small “stimuli”, can cause a big “reaction”. For example, manic patients often show a happy, over-enthusiastic day; depressed patients are depressed, depressed; some patients will appear emotional inversion, such as hearing the unfortunate news but laughing, learned of happy things but sighing. 3, interpersonal changes: cold to people, good to be alone, reluctant to participate in group activities, distant from friends and relatives, silent; or suddenly become overly enthusiastic, willing to help others. 4. Behavior and work: often absent-mindedness, procrastination, frequent mistakes, tardiness, early departure or absence from work for the whole day. Students may show unexplained absenteeism from school, decline in academic performance, etc. 5. Sudden change in living habits and routine: Patients often become lazy, do not get up on time, do not pay attention to personal hygiene, and sometimes do not follow the system. The patient often does not sleep well, often sits late at night with a lonely lamp, or does something that can be done during the day, or wakes up in the middle of the night and tosses and turns; some, on the contrary, spend most of the time in bed, the whole day is lethargic, the amount of food is sharply reduced, not to get something to eat at meal time, sometimes several meals in a row without food, and sometimes overeating, indiscriminate eating. Other aspects such as the arrangement of spare time and hobbies also show sudden changes. 6.A sharp drop in learning or work efficiency for no reason: for example, a sharp drop in academic performance, loss of interest in learning, inability to complete homework on time, and avoidance of school and exams by all means. People who have always been serious about their work suddenly fail to complete their work tasks, procrastinate or resist their work for no reason, and are very reluctant to go to work. 7, the will to decline: contrary to the original positive, enthusiastic, good learning state, become sloppy work, irresponsible, and even absenteeism, academic performance decline, do not pay attention to lectures, do not originally hand in homework, and even truancy; or life becomes lazy, grooming is not repaired, there is no enterprise, get by, often day high three pole and embraced by not. 8, the class of neurasthenia performance: headache, insomnia, dreamy and easy to wake up, do things to lose three or four, focus on concentration, seminal emission, menstrual disorders, tiredness and weakness, although there are many discomfort, but no pain experience, and do not actively seek medical treatment. If these complaints are not analyzed in depth, many patients will be misdiagnosed as “neurosis” and treatment will be delayed. 9. Short sporadic misstatements or things that others think should not be done: Because these things occur in short periods of time and are corrected and helped by others around them, they are often easy to ignore. If a person repeatedly says or does something wrong like this, he or she should be alert and seek treatment from a psychiatrist promptly and proactively. The above-mentioned points are the common symptoms and manifestations of psychiatric patients in the early stage of their illness. In short, when a person’s thinking, behavior, will, emotions and other aspects of the same as before, and I do not know, it may be the early signs of mental illness. Of course, it is not possible to conclude that a person is mentally ill just because he or she has some of the above-mentioned manifestations, but it is necessary to observe his or her entire mental activity in order to conclude that a person is mentally ill. In order to determine whether or not a mental abnormality is present, and to truly achieve early detection and early treatment, it is necessary to send the patient to a psychiatric hospital as soon as possible for examination, clear diagnosis, early detection, and early treatment, with a good prognosis, and to reduce the possibility of relapse.