The redness under the eyes of patients may be caused by conjunctivitis, subconjunctival hemorrhage, visual fatigue, etc. Patients should consult a doctor in time to clarify the cause of the disease and then carry out appropriate treatment. 1. Conjunctivitis: Inflammatory disease of the conjunctival tissue caused by infection and external stimulation. Under the stimulation of inflammation, patients may have conjunctival congestion, which is manifested as redness of the eyes, and may be accompanied by itchy eyes, tearing and other uncomfortable symptoms. Patients can use levofloxacin eye drops and other medications under the guidance of the doctor to control inflammation and relieve discomfort. 2. Subconjunctival hemorrhage: Patients with subconjunctival hemorrhage caused by rupture of subconjunctival microvessels may also experience redness under the eyes, which is usually not accompanied by other uncomfortable symptoms, and if there are no recurring episodes, there is no need for special treatment. 3. Visual fatigue: If the patient stares at electronic devices for a long time, visual fatigue may occur, and the patient may experience conjunctival congestion, eye dryness, soreness and other uncomfortable symptoms. It is recommended that patients with obvious eye congestion should consult a doctor in time to assess their condition and follow the doctor’s instructions for treatment.