The causes of headache and eye pain on the right side, mainly consider acute glaucoma attack, as well as other causes, etc., as follows: First, acute glaucoma attack: the sudden appearance of headache and eye pain on the right side, accompanied by vision loss, nausea, vomiting, this time to go to the ophthalmology department to do the measurement of intraocular pressure, to understand whether there is acute glaucoma. A part of patients in the acute glaucoma attack, mainly manifested as headache and eye pain on one side. Second, other causes: ask the patient what the nature of the pain is, whether it is tugging-like pain, whether there is touching the scalp with pain aggravation, whether it is paroxysmal or persistent pain. If the pain is paroxysmal, consider that the patient may have trigeminal neuralgia. It is also necessary to go for a cranial CT examination to find out whether there is acute intracranial hemorrhage causing the pain.