Pregnant women with sudden headaches and blurred vision are considered to be caused by sudden illnesses, which may be cerebrovascular disease or eclampsia in pregnancy hypertension. 1. Cerebrovascular disease: when the intracranial pressure increases, there will be headache, blurred vision, such as sudden cerebral hemorrhage, various causes of brain hernia will appear headache and blurred vision, then need to improve the cranial brain CT to clarify the diagnosis, if necessary, need to carry out emergency surgical treatment. 2. Eclampsia: pregnancy is a special period, there will be pregnancy hypertension, one of the cases is eclampsia, convulsions will occur, accompanied by dizziness, headache, poor vision, at this time, we need to give magnesium sulfate treatment, and actively lower blood pressure. Sudden headache and blurred vision, consult the hospital as soon as possible to clarify the cause of the disease, and then under the guidance of a specialized doctor to treat the symptoms.