Pain in the corner of the eye can be caused by trauma, inverted eyelashes and glaucoma. 1. Trauma: If the corner of the eye area is traumatized or a foreign object enters the eye, it may cause pain in the corner of the eye. 2. Inverted eyelashes: Due to developmental abnormalities, the direction of eyelash growth does not point to the front, but rather to the cornea, which can cause pain in the corner of the eye as the eye blinks and the eyeball rotates and scratches the cornea. 3. Glaucoma: acute attacks of glaucoma patients because of increased intraocular pressure, may lead to pain in the corners of the eyes, there may also be photophobia, tearing, headache, blurred vision, eye swelling and pain and other symptoms. There are many other causes of pain in the corner of the eye, such as mydriasis and blepharitis. Patients should go to the regular hospital in time, to clarify the cause of the disease, under the guidance of professional doctors for targeted treatment.