Having violent tendencies is not necessarily a mental illness. It is currently believed that the causes of the emergence of violent tendencies may be related to genetic predisposition, the influence of the state of mind, and environmental stimuli. If there is a tendency to violence, no other accompanying symptoms, no harm to individuals and others, it may be related to the recent psychological state, you can learn the way to self-control, and communicate with the community psychologist regularly; if there are hallucinations, delusions and other accompanying symptoms, or even harm others, it may be related to mental illness, such as schizophrenia, mania, bipolar disorder, paranoid psychosis, impulsive personality disorder and so on, and require prompt consultation and systematic treatment.1. Schizophrenia: Patients may have abnormalities in thinking, emotion, cognition and behavior, with a variety of clinical manifestations. Some patients with schizophrenia are unable to control their impulses due to altered cognitive state and may have sudden violent tendencies; 2, mania: it is a kind of schizophrenic affective disorder, which may have acute attacks under certain stimuli, manifesting as high mood, irritability, and often violent tendencies; 3, bipolar disorder: bipolar disorder has both manic and depressive episodes, and when manic episodes can be like mania 4, paranoid psychotic disorder: this disease to persistent systemic delusions as the main clinical manifestations, when the disease personality may be relatively intact, if others break the patient’s delusions, may stimulate the patient to appear violent; 5, impulsive personality disorder: also known as aggressive personality disorder, because of the inability to control impulses, there may be sudden anger and violent tendencies; 6, antisocial personality disorder. Such patients are unable to empathize, have indifferent feelings, lack a sense of shame, and usually continue to have a high degree of aggression and violent tendencies; 7. Post-traumatic stress disorder: some patients may also experience sudden violent behavior in response to trauma-related stimuli. It is especially important to note that violent tendencies are not necessarily psychotic, and certain children or adolescents may also have transient violent tendencies due to adverse circumstances and events. In this case, it is important to identify the cause, actively communicate, strengthen guidance, and participate in more group activities, such as running together and going out on trips.