The causes of patients’ itchy eyes mainly include physiological factors, infectious conjunctivitis, allergic conjunctivitis, contact blepharitis and so on. 1. Physiological factors: If the patient stares at the electronic screen such as cell phone, computer or reads in the place with insufficient light for a long time, it will lead to fatigue of both eyes, and the discomfort symptoms such as dry and itchy eyes can appear, which can be relieved after sufficient rest. 2. Infectious conjunctivitis: viral, bacterial and other pathogenic infections lead to infectious conjunctivitis, patients can appear conjunctival congestion, itchy eyes and other symptoms, patients can use tobramycin eye drops, ganciclovir eye drops and other medications under the guidance of a doctor to control inflammation and relieve eye discomfort. 3. Allergic conjunctivitis: Allergic conjunctivitis is caused by contact with allergens in patients with allergies, and patients may experience itchy eyes, photophobia, tearing and other symptoms. 4. Contact blepharitis: After the skin of the patient’s eyelids comes into contact with irritants or skin intolerant substances, the patient’s eyelids may develop redness, swelling, pimples, pustules, etc. The patient may also experience discomfort such as itchy eyes and a burning sensation. It is recommended that patients with noticeable itchy eyes seek prompt medical attention to assess their condition and standardize treatment under the guidance of a physician.