What causes bloodshot eyes and what should I do?

Generally, eye redness may be related to excessive eye use, eye fatigue, allergic conjunctivitis, keratitis, dry eye syndrome, and other causes. Patients are advised to rest appropriately and ensure adequate sleep. Under a doctor's guidance, medications such as epinastine hydrofumarate eye drops, chloramphenicol eye drops, and sodium hyaluronate eye drops may also be used for treatment. If discomfort occurs, seek medical attention promptly. Detailed analysis is as follows:

　　1. Excessive Eye Use: Prolonged use of electronic screens reduces blinking frequency, causing rapid tear evaporation and dryness of the eye surface, which may lead to redness, possibly accompanied by eye pain, stinging, or foreign body sensation. It is recommended to take regular breaks, look into the distance periodically, or close the eyes for a few minutes.

　　2. Eye Fatigue: Insufficient sleep or prolonged periods of work or study may prevent the eyes from adequate rest, resulting in symptoms such as redness and heaviness of the eyes, possibly accompanied by mild headache or orbital pain. It is recommended to ensure sufficient sleep and perform appropriate eye massage or warm compresses.

　　3. Allergic Conjunctivitis: Contact with allergens can trigger allergic reactions in the conjunctiva, causing redness, along with symptoms such as itching, tearing, and sneezing. Patients should use medications such as epinastine hydrofumarate eye drops, tobramycin dexamethasone eye drops, and sodium cromoglicate eye drops under medical guidance to aid recovery.

　　4. Keratitis: Infection of the cornea by pathogens such as bacteria, viruses, or fungi can cause corneal inflammation, leading to conjunctival redness, possibly accompanied by eye pain, photophobia, tearing, and vision loss. Patients are advised to use medications such as chloramphenicol eye drops, flumetholon eye drops, and erythromycin eye ointment under medical guidance to alleviate symptoms.

　　5. Dry Eye Syndrome: Insufficient tear production or excessive tear evaporation can cause dryness of the eyes, resulting in conjunctival redness along with dryness, foreign body sensation, and burning. Patients should follow medical advice promptly to use medications such as sodium hyaluronate eye drops, flumetholon eye drops, and cyclosporine eye drops for treatment.

　　In daily life, it is important to protect the eyes, maintain ocular hygiene, avoid rubbing the eyes, and promote ocular health.