Eye distention is a common symptom in ophthalmology and may occur in both the elderly and the young. The most common disease that causes eye distention in the elderly is glaucoma, especially in the acute phase of acute closed-angle glaucoma. Patients will have sudden, severe eye distention, which may be accompanied by ipsilateral headache and even nausea and vomiting, and is often misdiagnosed as gastrointestinal disease or central nervous system disease and sent to internal medicine for treatment. Of course, there are many reasons for eye swelling, besides glaucoma, there are also many other factors, such as inflammation of the eye, secondary to other systemic diseases, trauma and personal eye habits. The common causes of eye swelling and pain are iridocyclitis, endophthalmitis, glaucoma, and so on. Endophthalmitis is a more intense cause of eye swelling and pain because the bacteria causing the infection release a large amount of toxins that cause an inflammatory response throughout the eye. Traumatic lesions of the eye, such as blunt contusions, penetrating injuries, and rupture injuries, can also cause eye swelling and pain. Diseases in other areas, such as rhinitis, sinusitis, and cervical spondylosis, can cause distension of the eye. Inflammation of the supraorbital nerve can also cause eye swelling and pain. In addition, prolonged excessive eye use, especially close eye use, frequent late nights, smoking and drinking can cause eye swelling and pain. There are also some neurological diseases, such as migraine, which can cause pain in the eye when a headache strikes and is mistaken for a disease of the eye itself. However, this condition needs to be identified by a doctor, so you should seek medical attention as soon as possible at the onset.