We can check from the following points: 1, instrumentation: such as dress more than usual overly colorful or strange; or unkempt hair, do not deal with personal hygiene. 2, consciousness: such as no response to external stimuli, often dazed, or inattentive. 3.Orientation: confusion about time, place and people. 4, perception: mental illness often appear commonly known as hallucinatory symptoms, the most common is auditory hallucinations, the patient’s ears to hear voices, in fact, no one around, and these voices may be scolding the patient or praise him, or told to do something (such as suicide, attacking others, etc.). Some patients do not say he has this strange experience, but people around him can judge from his talking to himself, laughing for no reason, or gesticulating, losing his temper for no reason, etc. that he may have symptoms of hallucinations. Some patients may also experience hallucinations or physical hallucinations. Sometimes the patient will feel a foreign body, or insects crawling and so on. 5, thinking: the most common is that patients have some strange ideas that are detached from reality. They have wrong views on certain things, but they are convinced, such as thinking that what happens around him is related to him, or are saying bad things about him; believing that other people will harm him; believing that he is controlled by external forces; believing that he has superhuman ability and can do things that other people can not do; or believing that he has done something wrong to others; or believing that other people are in love with him; or believing that ghosts and gods are possessing him, and so on. 6.Emotions: such as crying and laughing erratically, more than usual high excitement; or excessive sadness; or fidgeting; worried about not knowing what is going to happen; nervousness, fear, fear, etc.. 7, action behavior: such as strange behavior, do some incomprehensible actions (such as picking up garbage, repeated bathing, etc.); or destructive behavior; or aggressive behavior. 8. Life: e.g. work or family affairs cannot be sustained; or academic performance falls down, but no reasonable cause can be found to explain; inability to take care of oneself, appearing to be more childish; or interpersonal relationship retreats. Some people’s illnesses occur more slowly and unknowingly, while others progress suddenly and rapidly. However, once you notice all the above strange words and behaviors, you should seek psychiatrist’s assistance as soon as possible.