The clinical manifestations of intracranial tumors are two categories: symptoms of increased intracranial pressure and focal symptoms, which may appear sequentially or simultaneously, or only one of them. In fact, some of the early symptoms of brain tumor are relatively obvious. Some may have different clinical symptoms depending on the location of tumor growth. For example, in frontal lobe tumors, irritating lesions may produce epilepsy, such as astrocytoma in 50% of patients with epilepsy, while destructive lesions may cause limb paralysis, aphasia and psychiatric symptoms, such as mesenchymal astrocytoma with intracranial elevation, hemiparesis, neurological weakness, memory loss, confusion, and epilepsy and endocrine disorders in early stages. Some of them may have different clinical symptoms depending on the function of the tumor. For example, in pituitary tumors, male cases of lactogenic adenoma may have early symptoms of hypoactive sexual desire, but often go unnoticed. In many cases, the symptoms are so atypical that the department or doctor does not think about the effects of the tumor in the brain. For example, the first symptom of thyroid hormone adenoma may be hyperthyroidism or neck enlargement, and in such cases, the patient is often referred to the thyroid department for treatment and misses screening for intracranial tumors. Therefore, for brain tumors, it is important to have annual checkups and at least one head CT to clarify the basic changes of the disease, so that early detection and treatment can be achieved.