Disordered and peculiar behavior is one of the clinical manifestations of mental disorder associated with intracranial tumor. Mental disorder associated with intracranial tumor refers to the mental disorder associated with the invasion of brain parenchyma by intracranial tumor and compression of adjacent brain tissues or cerebral blood vessels, resulting in the destruction of brain parenchyma or the increase of intracranial pressure. What causes intracranial tumors with psychiatric disorders? The incidence of psychiatric symptoms is significantly higher in temporal lobe tumors than in tumors of other sites. Temporal lobe tumors often show audiovisual hallucinations, while frontal lobe tumors often show comical movements and speech, and there are differences in the effects of tumors located in the left or right hemisphere of the brain on psychiatric symptoms. Rapidly growing tumors with increased intracranial pressure tend to present with acute organic brain syndrome; chronic growing tumors tend to cause cognitive impairment or local neurological deficit symptoms, and slow growing tumors cause cognitive deficits related to pre-onset intelligence. Factors affecting the psychiatric symptoms caused by intracranial tumors 1. gender and age. 2.Duration of disease. It refers to the period between the onset of disease and hospital admission. Luo Zhongzheng (1963) reported that patients with intracranial tumors with psychiatric symptoms had a shorter disease duration than those without behavioral changes, suggesting that the appearance of psychiatric symptoms is likely to attract the attention of the surrounding and early consultation. 3. Heredity. The exact cause of intracranial tumor is still unknown. 4.Tumor site. Tumors that infiltrate and affect both hemispheres are likely to cause psychiatric symptoms. 5.Increased intracranial pressure. In addition to headache, vomiting and optic disc edema, there may be dizziness, blurred consciousness, emotional indifference, mental retardation and even coma, which can be reduced or disappeared when decompression surgery or hypertonic glucose infusion is applied. 6, mental factors. In addition to personality traits and individual quality, mental trauma is also a factor that triggers some intracranial tumor patients to cause mental symptoms.