Common causes of eye redness include foreign body irritation, bad habits, eye infections, eye allergies, elevated intraocular pressure, etc., which need to be treated for specific causes. 1. Foreign body stimulation: such as eyelashes, dust, etc. into the eyes or wear contact lenses for a long time, can produce a certain degree of irritation of the conjunctiva, resulting in conjunctival congestion, eye redness, usually after the removal of foreign bodies for a period of time can be alleviated. 2. Bad life habits: such as staying up late or using electronic products for a long time, which can lead to eye fatigue, dryness and conjunctival congestion. At this time, the eyes should be relaxed in time, and artificial tears can be used to keep the eyes moist. 3. Eye infections: such as bacterial or viral infections caused by conjunctivitis, keratitis and other diseases, can also lead to eye redness and swelling. Antibiotic eye drops, such as levofloxacin eye drops, are usually used for treatment. 4. Eye allergy: If you are exposed to certain allergens, including pollen, willow, dust, etc., allergic conjunctivitis and other diseases can occur, resulting in conjunctival congestion, eye redness. Anti-allergic drugs such as loratadine can be taken under the guidance of physicians for treatment. 5. Elevated intraocular pressure: elevated intraocular pressure can cause conjunctival congestion, such as glaucoma attacks. At this time, β-adrenoceptor blockers and other drugs can be used to reduce intraocular pressure, but also choose trabeculectomy and other surgical treatment. If the redness of the eye is caused by pathological factors, you should consult a doctor in time to clarify the cause of the disease, and under the guidance of the physician to treat the cause of the disease in order to alleviate the symptoms.