Eyelid itchiness is considered to be caused by allergic conjunctivitis, contact dermatitis or excessive use of electronic products. 1. Allergic conjunctivitis: Eyelid itching caused by allergic conjunctivitis is generally caused by contact with allergens, the conjunctiva is often exposed, easy to come into contact with airborne allergens, and is also susceptible to infection by bacteria or other microorganisms. Eyelid itching is a common symptom, accompanied by tearing, burning sensation, photophobia and increased secretion. 2. Contact dermatitis: Eyelid itching caused by contact dermatitis is generally caused by drugs or cosmetics, and localized redness, swelling and itching around the eyes will occur. 3. Excessive eye use: Eyelid itch caused by long-term use of electronic products, accompanied by visual fatigue, dryness, itching, difficulty in opening the eyes and other symptoms, usually after rest and adjustment can be recovered on their own. Itchy eyelids should pay attention to a light diet, eat less spicy and stimulating food, pay attention to rest to avoid overwork. If the symptoms are serious, you should go to the hospital in time for targeted treatment.