Itchy eyes may be caused by conjunctivitis, keratitis, allergic blepharitis and so on. 1. Conjunctivitis: mainly caused by bacteria, viruses, chlamydia, allergic reactions, chemical or physical factors, resulting in patients with itchy eyes, accompanied by vision loss, tingling, sandy sensation or foreign body sensation. 2. Keratitis: due to the weakening of the cornea’s defense ability, external or endogenous pathogenic factors attack the corneal tissue, resulting in patients with itchy eyes, accompanied by vision loss, eye pain, tearing and other symptoms. 3. Allergic blepharitis: mainly a variety of exogenous allergens caused by abnormal immune response of the body, resulting in inflammatory lesions of the eyelid skin, but also with hereditary allergies, infections, endocrine disorders and other factors, resulting in itchy eyes, accompanied by irritation, burning sensation and other discomforts. It is recommended that patients go to the hospital in a timely manner, under the diagnosis of the doctor, according to the patient’s specific condition, to take targeted treatment, life should avoid scratching, clean eye secretions in a timely manner.