Brain swelling may be related to poor rest, high blood pressure, vascular disease and other reasons. 1. Poor rest: If a person has insomnia, staying up late, dreaming, etc., which affects sleep, the brain can be in a state of lack of oxygen, which can cause swelling of the brain. 2. High blood pressure: when the patient’s blood pressure rises, the blood vessels in the head will expand, which can cause brain swelling. 3. Vascular disease: If there is cerebral arteriosclerosis or vertebral artery atheroma, it may cause insufficient blood supply to the brain and brain swelling. It is recommended to go to the regular hospital in time to see a doctor to clarify the cause of the brain swelling, under the guidance of the doctor for standardized treatment, so as not to delay the condition of the body to bring about adverse effects.