Patients with sudden headache and blurred vision mainly consider the following causes: 1, if the patient has previous hypertensive disease, this condition may be caused by hypertensive encephalopathy, mainly seen after a rapid increase in blood pressure, which will lead to increased intracranial pressure in the patient’s brain, the patient will quickly appear headache, nausea, vomiting, blurred vision symptoms; 2, if the patient has cerebral infarction, cerebral hemorrhage and other diseases The symptoms of blurred vision and headache will also appear suddenly. This is usually seen in large cerebral infarction or cerebral hemorrhage, where the headache is usually more intense and may be accompanied by jet-like nausea, vomiting and other problems; 3. Patients with sudden blurred vision and headache should also be considered to be caused by glaucoma, when glaucoma, the patient’s intraocular pressure will increase and headache, vision loss and visual field loss will occur.