Itchy allergic eyes are considered to be caused by allergic conjunctivitis. This is an inflammation of the conjunctiva caused by an allergic reaction of the eye tissue to an allergen. Clinically, the patient will present with extremely itchy eyes with increased mucous filamentous discharge. Some patients have allergic rhinitis or even allergies. There are many causes of allergy. Some patients have frequent recurrent attacks in spring and autumn, which may be related to pollen sensitivity; some patients are caused by contact with cosmetics, corneal contact lenses or cleaning solutions; there may also be allergies caused by various eye drops that are usually used, etc. Therefore, if the symptoms of red, itchy eyes appear, the symptoms can sometimes be quickly eliminated by quickly removing the allergen. You can consider using various anti-allergy eye drops, such as mast cell stabilizer eye drops, antihistamine eye drops, or corticosteroid eye drops for a short period of time. In severe cases, systemic anti-allergy medications such as chlorpheniramine, antihistamines, hormones, etc. can be added. Cold compresses on the eyelids or staying in an air-conditioned room can help relieve the symptoms. If the allergen is clearly identified, desensitization treatment can be considered, which is relatively effective for allergic conjunctivitis caused by plant pollen or weeds. Try to pay attention to eye hygiene and environmental sanitation, and avoid contact with pollen and other allergens as much as possible.