Itchy and painful eyes may be caused by overuse of eyes or diseases such as conjunctivitis and keratitis. 1. Excessive eye use: If you look at electronic products or books for a long time without sufficient rest, it may cause visual fatigue, which may lead to itchy and painful eyes, and part of the population may also have blurred vision. 2. Conjunctivitis: Conjunctivitis is mainly caused by infection, immunopathy or external stimulation, patients will have symptoms such as itching and pain in the eyes, accompanied by redness and swelling of the eyes, increased secretion and other symptoms. 3. Keratitis: eye itching and pain may also be caused by keratitis, keratitis is mainly caused by bacteria, viruses or fungi and other pathogenic microorganisms invasion and infection, but also may be the accessory tissues of the cornea caused by inflammation. In addition to eye pain and itching, the patient will also have photophobia, tearing and other symptoms. There are more causes of itchy and painful eyes, it is recommended to rest more, avoid overwork, you can go to the hospital for relevant examinations to clarify the diagnosis.