Swelling and pain in the corner of the eye may be caused by eye trauma, acute angle-closure glaucoma and blepharitis. 1. Ocular trauma: The swelling and pain in the corner of the eye of the patient may be caused by ocular trauma, the patient’s eye if the external force blows, so that the eye capillary rupture bleeding, can lead to the patient to appear in the eye red, swollen, pain, bleeding and other symptoms of discomfort. 2. Acute closed-angle glaucoma: patients with eye swelling and pain may be acute closed-angle glaucoma caused by acute closed-angle glaucoma, acute closed-angle glaucoma is a sudden closure of the angle of the anterior chamber and caused by intraocular pressure rise sharply in eye disease. Patients may have obvious eye swelling and pain, headache, nausea and vomiting, vision loss, etc. If treatment is not timely, blindness can occur in a short period of time. 3. Blepharitis: Blepharitis is a purulent inflammation of the glands of the eyelids, which can lead to discomfort such as swelling and pain in the corners of the eyes, and with the development of the disease, an abscess of the eyelids can also be formed. It is recommended that patients with significant swelling and pain in the corners of the eyes seek medical attention to assess their condition and treat them under the guidance of a doctor.