After a blockage of blood vessels in the head, dizziness, headache, black haze, blurred vision and confusion may occur in the head. Blockage of blood vessels in the head may cause local blood flow to be reduced or blood supply to be interrupted, resulting in ischemia and lack of oxygen in brain tissue, which may lead to dizziness and headache, black haze or blurred vision in one eye or both eyes, and numbness or weakness of limbs, and in severe cases, may also lead to delirium or even shock and other symptoms. Cerebrovascular blockage may also be accompanied by other symptoms. Patients should consult the doctor in time, and thrombolytic therapy with alteplase can be used within 4.5h, and antiplatelet drugs such as aspirin can also be taken. Daily control of blood pressure, treatment of underlying diseases and regular check-ups are required. Please follow the doctor’s prescription for medication.