Eyes full of red blood, may be dry eye, conjunctivitis and other causes, may also be excessive fatigue and other physiological factors. 1. Dry eye: if the eyes are full of red blood, there is no eye drainage, secretion and other phenomena, it may be caused by dry eye, due to the patient’s prolonged look at the computer, cell phone or other electronic screens, resulting in increased instability of the tear film, appearing in the eyes are full of red blood, the use of sodium vitreous oxide eye drops, hydroxypropylmethylcellulose and other relief of the symptoms. 2. Conjunctivitis: may be caused by pathogenic microbial infections, such as viral infections caused by conjunctivitis, there will be a foreign body sensation in the eyes, burning sensation, accompanied by red blood in the eyes, and in severe cases, it will also cause a loss of vision, you can follow the doctor’s instructions to use ganciclovir eye drops, acyclovir eye drops for treatment. 3. Excessive fatigue: If you don’t get any rest for a long time and often stay up late, you will have the symptom of red blood in the eyes, so pay attention to rest and ensure enough sleep to relieve the symptom. Therefore, patients with red blood in the eyes, after resting the symptoms can not be relieved, and accompanied by other discomforts, should go to the hospital as soon as possible, and follow the doctor’s instructions for standardized treatment.