Whether having a cyst in the brain is serious or not should be judged and analyzed according to the size of the tumor and whether or not there is any compression being carried out. 1. If the size of the cyst is small and there are no obvious symptoms, it may belong to a relatively less serious situation. If the cyst does not increase in size and continues to be asymptomatic, you can choose to observe it first, with an interval of about half a year to a year to reexamine it. 2. If the size of the cyst is large or there are obvious symptoms, it may be more serious. If not treated in time, symptoms such as dizziness, headache, nausea, vomiting and so on may worsen, and in serious cases, it may also compress the optic nerve and blindness may occur. Once there is a cyst in the brain, the patient should go to the neurosurgery department of the regular hospital in time, and be treated under the doctor’s knowledge. During the period of treatment, patients should pay attention to rest and ensure sufficient sleep.