Diabetic eye redness may be due to conjunctivitis, keratitis and other causes, it is recommended to consult a doctor in time. 1. Conjunctivitis: the cause of conjunctivitis is complex, but clinically more common for bacterial and viral infections caused by conjunctivitis. Typical symptoms of conjunctivitis are dilation and congestion of the conjunctival blood vessels, redness and swelling of the eyes, accompanied by itching; fever, sneezing, coughing and other symptoms may occur if the symptoms continue to worsen. 2. Keratitis: Keratitis can be caused by bacterial or fungal infections, allergic reactions, etc. It is similar to conjunctivitis in that it can be characterized by redness and swelling of the eyes, but at the same time, it can be characterized by pain in the eyeballs, photophobia, eyelid spasm, and tearing, etc. It is recommended to go to the hospital in time to have the above symptoms. It is recommended to go to the hospital promptly if the above symptoms occur.