If the cancer is not controlled in time, then it will gradually metastasize to other parts of the body, such as the brain. Once the cancer metastasizes to the brain, then it will lead to headache, nausea and vomiting, mental abnormality as well as vision loss, limb paralysis and other symptoms. 1. Headache: This is a typical symptom. When the cancer metastasizes to the brain, it will cause some pressure on the head nerves, so paroxysmal or persistent headache will often occur. 2. Nausea and vomiting: when the cancer metastasizes to the brain, many tissues and organs in the body will be damaged, which will lead to the decline of gastrointestinal function and cause nausea, vomiting and other problems, and in severe cases, it is even difficult to maintain the basic food. 3. Mental abnormality: with the attack of cancer cells on the prefrontal lobe of the brain, the mental activity of this part will be affected, which will lead to mental abnormality. 4. Loss of vision: after the cancer metastasizes to the brain, the cancer cells will attack the nervous system to a certain extent and increase the intracranial pressure, which will cause blood flow problems in the eyes and lead to loss of vision and other symptoms. 5. Limb paralysis: due to the tumor or edema around the tumor, the brain tissues or nervous system will be compressed, which will cause symptoms such as monoparesis, hemiparesis, limb movement disorder and so on. In this regard, patients should timely treat the cancer disease, actively cooperate with the doctor’s arrangement, and strengthen daily care, maintain healthy diet and living habits to avoid cancer metastasis to the brain.