The patient’s eyes are a bit swollen and painful for more reasons, which may be related to overuse of eyes, keratitis, glaucoma and so on. 1. Excessive eye use: if the patient overuse eyes, long time close eye use, such as reading books, watching TV, etc., the patient may appear visual fatigue, but also eye swelling, dryness and other uncomfortable symptoms. 2. Keratitis: due to infection, lack of vitamins and other reasons can cause inflammation of the corneal tissue, patients may appear photophobia, eye swelling, tearing and other symptoms. 3. Glaucoma: In acute attack of glaucoma, the patient’s intraocular pressure continues to increase, which can cause pressure and damage to the eyes, resulting in eye swelling and pain, photophobia, vision loss and other discomforts, which can also be accompanied by headache, dizziness, nausea, vomiting and other systemic discomforts. It is recommended that patients with significant eye swelling and pain should consult a doctor to assess their condition and follow the doctor’s instructions for treatment.