Brain cancer is formally called craniofacial tumor, and it has two pathological types: benign and malignant, but there are also junctional tumors. The reason for the symptoms caused by brain cancer is firstly, the effect of compression, and secondly, some of them secrete a series of substances that cause various functional abnormalities. Depending on the location and function of brain cancer, the clinical symptoms caused by brain cancer are also different. The most common symptoms are headache and dizziness, nausea and vomiting. If the tumor grows in the frontal lobe, it often causes personality change, that is, the original introverted personality is now extroverted, or memory loss; if the tumor grows in the parietal lobe, it often causes numbness and weakness of the limbs; if the tumor grows in the temporal lobe, it often causes seizure, which is a manifestation of epilepsy, and some of them also cause speech impairment; if the tumor grows in the occipital lobe, it often causes visual field loss. If the tumor grows in the occipital lobe, it will cause visual field loss and vision loss; if the tumor grows in the cerebellum, it will cause unstable walking and even swallowing disorder. In addition, endocrine tumors such as pituitary tumors can cause lactation, irregular menstruation, infertility, and ventricular meningioma, which can cause hydrocephalus. Therefore, there are many different symptoms caused by tumors, so once you find any related symptoms, you must go to the hospital for relevant examinations in time to clarify the diagnosis and treatment methods.