If a patient presents with red blood in one eye, it is recommended that the patient immediately go to an eye clinic for an examination, considering that there should be an eye disease. There are many clinical conditions that can cause redness in the eye, including conjunctivitis, keratitis and even iritis, and the main way to eliminate redness is to clarify the specific cause after examination and take symptomatic treatment. If the patient has conjunctivitis, topical use of effective, sensitive antibiotics or antiviral drugs can cure the patient’s condition; if it is keratitis, in addition to the use of antibiotics or antiviral drugs, you should also use drugs to repair the cornea; if it is iritis, you should also use topical hormonal and pupil-dilating drugs according to the condition. Therefore, patients with red bloodshot eyes should immediately go to an eye clinic for examination and symptomatic treatment according to their condition.