Brain tumor usually refers to cranial brain tumor, and its preliminary manifestation varies according to specific diseases and pressure areas. The tumor forms intracranial hypertension, thus stimulating the vomiting center, and the patient will experience jet vomiting. The patient usually does not have gastrointestinal disease reactions, such as diarrhea, abdominal distension, abdominal pain, etc.; 3. Optic nerve papillary edema: intracranial hypertension can cause obstruction of blood return and affect blood supply, the patient may experience sudden blurring, transient darkness and gradual loss of vision. 4.Local dysfunction: patients with different locations of cranial tumor will have corresponding local dysfunction, such as single eye protrusion, unilateral deafness, patients with cranial tumor located in cerebral hemisphere will have unilateral limb sensory abnormality in early stage, if patients are olfactory meningioma, their early symptoms will also show decreased sense of smell; 5.Mental abnormality: patients can show hallucinatory hearing, hallucinatory smell, some patients also have abnormal memory, decreased speech and other abnormalities. Some patients also have abnormal sensation and behavior such as memory loss and speech confusion. If cranial tumor develops to middle and late stages, patients will have more serious symptoms, such as hemianopsia, gigantism, acromegaly and other serious symptoms. If the above symptoms exist, it is recommended that patients should seek medical attention in a timely manner and should not delay the treatment and diagnosis of the disease.