There are many causes of eye swelling, such as inflammation of the eye, glaucoma, trauma to the eye, and other causes. 1. Inflammation of the eye: Inflammatory lesions occur in the eye, including intraocular inflammation or inflammation of the eyelid. It needs to be treated symptomatically and causally for the primary disease, and the swelling will disappear after the inflammation is under control. 2. Glaucoma: Glaucoma will increase intraocular pressure and cause irritation. The conjunctiva and cornea will be edematous and the eyes will be swollen. Glaucoma needs to be treated and the swelling will go away. 3. Trauma to the eye: Injury to the eye, or dirt getting into the eye, can cause the eye to swell. The eye needs to be cleaned and the wound treated. 4. Other causes: Swollen eyes can be caused by mosquito bites, recurrence of surgically treated eye diseases, poor sleep quality or drinking water before going to bed. Need specific causes specific treatment. If the eyes are swollen because of the above reasons, you need to go to the eye hospital in time for examination and treatment.