Why do people go psychotic? Why do people become neurotic actually refers to why people become mentally ill. The first factor is genetic, for example, parents and other immediate family members with a history of mental illness are more likely to have children with mental illness than the general population. The second factor is personality, for example, people who are more introverted, not good at expressing their emotions, not good at socializing tend to have a higher probability of depression. The third aspect is some social and psychological factors, such as excessive life pressure, and a variety of those who compete too much pressure, which can lead to emotional loss of control, but also easy to trigger mental illness. The fourth aspect is intracranial diseases, such as infections and brain atrophy, some traumatic brain injury can also trigger mental illness.