Dry and itchy eyes of patients may be caused by allergic conjunctivitis, dry eye, and certain systemic diseases. 1. Allergic conjunctivitis: After contact with allergens such as pollen and dust, allergic reaction occurs in the conjunctival tissue, and the patient may suffer from itching, foreign body sensation, dryness, photophobia, tearing, and other uncomfortable symptoms. 2. Dry eye: dry eye refers to the tear secretion disorder caused by many factors, with dry eyes as the main symptom, patients often accompanied by itching, foreign body sensation, burning sensation, or photophobia, blurred vision, vision fluctuations and other discomforts. 3. Systemic diseases: patients with systemic diseases, such as dry syndrome caused by autoimmune system abnormalities, can have dry and itchy eyes and other discomforts. It is recommended that patients with severe symptoms of dry and itchy eyes consult a doctor in time to assess their condition and follow the doctor’s instructions for treatment.