Malignant tumors of the brain often increase in size in the advanced stages of the disease, causing compression of the surrounding brain tissue, blood vessels and nerves, and leading to widespread brain tissue cell edema. This results in diffuse brain edema and increased intracranial pressure, leading to severe headache, dizziness, nausea, vomiting and a strong feeling of vertigo. In addition, as the tumor compresses the surrounding tissues, it may cause abnormal discharge in the cerebral cortex, thus inducing the possibility of seizures. When the tumor invades the motor function area, it may cause abnormal sensation in one or both limbs, such as numbness, pain, pins and needles, and may lead to progressive weakness or even hemiparesis. In the advanced stage of the disease, the tumor may even cause compression on the brainstem due to its large size, resulting in disorders of the patient’s vital signs.