Headache and difficulty in seeing may be caused by hypertension, glaucoma, cerebrovascular disease and other causes. 1. High blood pressure: When blood pressure rises suddenly, it may affect the function of the eyes, and the patient may have the symptom of not being able to see clearly, accompanied by headache and other symptoms. 2. Glaucoma: When glaucoma strikes acutely, the pressure in the eyes increases, which can affect vision, leading to blurred vision and headaches. 3. Cerebrovascular disease: When cerebrovascular disease, such as cerebral hemorrhage, occurs, patients may experience headache, vision loss, cranial nerve damage and other symptoms. It is recommended that people who have headaches and can’t see well should go to regular hospitals in time to clarify the causes and carry out standardized treatment under the guidance of doctors.