Red blood in the white of the eyes of patients may be caused by visual fatigue, conjunctivitis, glaucoma and so on. 1. Visual fatigue: If patients use their eyes excessively or stay up late for a long time, patients may experience conjunctival congestion, i.e., an increase in red blood in the whites of the eyes, and patients may also experience discomfort such as dry eyes and itchy eyes. After resting the eyes, the discomfort can be relieved. 2. Conjunctivitis: Conjunctivitis patients in the inflammation stimulation, there may be tearing, photophobia, eye secretion increase and other discomforts, patients can follow the doctor’s instructions to use antibiotic eye drops, such as levofloxacin eye drops, tobramycin eye drops, etc., to promote the recovery. 3. Glaucoma: If patients with glaucoma have an acute attack and the intraocular pressure rises, patients may experience conjunctival congestion, which may be accompanied by symptoms such as photophobia, tearing, eye swelling and pain. 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.