Patients with red eyes mostly refer to conjunctival congestion, which may be related to visual fatigue, dry eye, conjunctivitis, eye trauma and other factors. 1. Visual fatigue: if the patient over-exerts his eyes, often stays up late, and does not have enough rest when using his eyes for a long time at close range, visual fatigue will occur, and the patient may have conjunctival congestion, so the patient’s eyes will appear to be red with an increase in the number of bloodshot manifestations. 2. Dry eye: dry eye belongs to the ophthalmology of the more common diseases, because the patient’s eye surface of the tear film is not stable, there can be conjunctival congestion, dry eyes, foreign body sensation and other symptoms of discomfort, the patient can follow the doctor’s instructions to use artificial tears eye drops treatment, such as sodium vitrate eye drops, etc., to alleviate the discomfort of the eyes. 3. Conjunctivitis: Conjunctivitis caused by bacterial, viral and other pathogenic infection or allergy, under the stimulation of inflammation, patients may experience conjunctival congestion, photophobia, tearing and other discomfort symptoms. 4. Ocular trauma: patients with ocular trauma may also experience conjunctival congestion and subconjunctival hemorrhage. 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.