Why is there red blood in the eye

There are many reasons for red blood in the eyes. First of all, it may be caused by factors such as staying up late, getting angry, eye fatigue, etc. Secondly, there may be inflammatory infections in the eyes, such as conjunctivitis, keratitis, etc. It is best to go to the hospital for an eye examination. If it is conjunctivitis, antibiotic eye drops can be used externally.