The prominent manifestations of mental illness are abnormal thinking, confused speech, emotions that are not in harmony with the external environment, and bizarre, disordered behavior. These are the manifestations of the severe stage of the disease. If we pay attention, we can often find some changes that appear in the early stage of the patient, and these changes are mainly manifested in personality, speech and behavior. In daily life, if a person has the following conditions for a longer period of time, it indicates the possibility of mental illness. Personality change When a person’s personality changes over a long period of time and seems to be a different person, it is worth to be alert. The person who was cheerful and loved to make friends became cold to people, distant, withdrawn and out of touch with others; avoided friends and relatives when they visited, and no longer talked to parents, wife and children as usual; did not care about the life, study and work of family members, and was indifferent to others’ concern; the person who originally paid attention to neatness became lazy, had poor personal hygiene, dirty and unkempt living room. Those who are motivated become undisciplined, irresponsible, unmotivated, and even absent from work; students who used to demand advancement become often late, leave early, inattentive, unable to complete homework on time, truant for no reason, feel indifferent to the decline in academic performance, and ignore the advice of people around them. For no reason, they become unusually depressed, sullen, sad, sighing, feeling useless, inferior to others, lasting more than half a month without relief; good to sit alone, not interested in the surrounding things, depressed; unpredictable mood, sad and tears or angry because of trivial things; the original character of quiet, mild-tempered people become unreasonable, no manners to others, vulgar language The person who was particularly introverted and inexpressive becomes unusually high in mood, complacent, arrogant, nosy, and pretentious. For no reason at all, the person may feel nervous, anxious, panic-stricken, restless, fearful, and have a sense of disaster. Change of speech: A person who is usually very introverted suddenly becomes very talkative and happy; talk big, argue with others, often make some unrealistic ideas and ideas. Less talk: A person who usually loves to talk and laugh suddenly becomes sullen, does not take the initiative to care about others, and speaks little; he or she obviously feels memory difficulties and slow reaction. Talking confused: When talking or writing with others, they always use a more out-of-the-way vocabulary, or always use inappropriate and inappropriate words; they can’t stick to the topic in the conversation, giving people the impression that they are pulling and pulling, and it is difficult to communicate; behind closed doors, they are immersed in meditation, and the content of their thoughts has no realistic meaning and has no connection with the environment at that time. Talk strange: suspicious, especially sensitive to the words and actions of others, think that the words and actions of others are directed at themselves, and when they hear others speak, they suspect that they are talking about themselves. This kind of paranoia is different from normal people’s paranoia in that although it is confirmed that this is not the case, the patient is still convinced and cannot be persuaded. For example, he thinks that what is on TV, on the radio, in the newspaper is related to him; he is afraid and upset because he feels that his colleagues, neighbors, or even his parents and brothers want to harm him; he thinks that he is loved by others (in fact, the other party does not have such feelings at all), and often haunts with the other party. If there is some physical discomfort, they suspect that they are being controlled by advanced instruments, or they think they are suffering from some incurable disease. Change in demeanor Some people can have some changing interests and strange hobbies that are inconsistent with their previous habits, giving the impression of being bizarre and eccentric. For example, they often collect meaningless objects, or even carry around some fruit peels and waste paper, collect some waste and hold it as the most precious. Do some inexplicable, puzzling actions, can be manifested as walking posture strange, dull and repetitive movements, no purpose, etc.. For example, a patient walking, walking and suddenly return, asked the reason, the patient also can not answer. Another patient soaked his shoes in a washbasin filled with water and repeatedly scrubbed them, but when asked why, he replied that each person had his own way of brushing his shoes. The sudden appearance of some unexpected and incomprehensible behaviors, such as suddenly deciding to give up a good job without any reason, or suddenly deciding to take a break from school or give up studies. For example, a student in a college who is doing well in his studies suddenly decides to quit school and quickly goes through the withdrawal process. When asked the reason, he replied that he was tired and wanted to take a break for a year or two. Silent, expressionless, or standing, sitting, eyes straight, alone, not social, or mumbling, crying and laughing, incomprehensible. The movement is sluggish, things are lost, just put down the items, turn around and can not be found. Often forget the promises made or the tasks that should be completed, often make mistakes in the work, and the efficiency of work is significantly reduced. People who were frugal become reckless spenders, overly concerned about dressing up, generous, and even reckless in their spending. Some feel changes in self, others or the outside world, and give unreasonable attention. For example, a female patient felt that her face was growing asymmetrically and getting stronger. She looked in the mirror frequently at home and went to the hospital several times to ask for corrective surgery. Although the doctor patiently explained that no surgery was needed, the patient was still distressed and frightened by this and sat for long hours in front of the mirror (speculum) examining her face. Other changes Sleep: good or bad sleep is a barometer of changes in the condition of psychiatric patients. Abnormal sleep is a signal of many early psychiatric diseases, mainly manifested as difficulty in falling asleep, easy waking, dreaminess, early waking, and mostly without obvious reasons. Some patients, even if they stay up all night, do not feel tired the next day, and are apparently too energetic. They do not actively seek medical attention, but careful observation can reveal that the patient is inattentive and moody. Some patients feel sleepy, but as soon as they lie down in bed, their sleepiness disappears and they have a lot of thoughts. The next day, the patient is drowsy and exhausted. Memory: Memory loss, especially near-memory loss, and forgetting what you have just done.