Swelling and pain in the corners of the eyes of patients may be related to blepharitis, acute angle-closure glaucoma, poor hygiene habits and other reasons. 1. Blepharitis: Blepharitis refers to purulent inflammation of the eyelid glands. Under the stimulation of inflammation, patients with blepharitis may experience discomfort such as redness, swelling and pain in the eyelids. 2. Acute closed-angle glaucoma: Acute closed-angle glaucoma can cause swelling and pain in the corners of the eyes due to a sharp rise in intraocular pressure, and can be accompanied by nausea and vomiting. 3. Bad hygiene habits: If the patient has bad hygiene habits such as rubbing the eyes with hands frequently, it can cause inflammation in the corners of the eyes, resulting in redness, swelling and pain. It is recommended that people with swollen and painful eyes go to the hospital in time to clarify the cause of the disease, and carry out standardized treatment under the guidance of the doctor, so as to avoid delaying the condition.