Itchy eyes are a very common phenomenon in everyday life and can occur in people of all ages, with no gender differences. The most common cause is an allergic factor. For example, allergies to foods, medications, and the surrounding environment. There are also many other causes of itchy eyes, such as inflammation of the eye, conjunctivitis, keratitis, ulcerative blepharitis, scaly blepharitis, etc. Inflammation of the eye can be caused by bacteria, viruses or fungi. Itchy eyes can also be caused by irritation from bright light such as ultraviolet light or radioactive rays. Itchy eyes can also be caused by overuse of the eyes, such as prolonged exposure to electronic screens, prolonged close work, and frequent late nights. Some eye surgeries, such as pterygium surgery, glaucoma surgery, vitreoretinal surgery, etc., are performed on the surface of the eye, and the exposed sutures can irritate the eye and cause itchy eyes. As mentioned above, the main cause of itchy eyes is allergic factors, caused by allergic diseases, followed by some infectious factors. Of course, also and personal constitution, living habits. The itchy eyes should be examined by the ophthalmology department of a regular hospital for treatment according to the diagnosis.