Bloodshot eyes can be caused by many reasons, such as visual fatigue, conjunctival or other eye inflammation, subconjunctival hemorrhage, etc. Different treatments are needed according to different causes. 1. Visual fatigue: overuse of the eyes, staying up late, etc. can lead to eye congestion. Visual fatigue can be relieved by resting the eyes, paying attention to the strength of the eyes, correcting bad eye habits, and applying local hot compresses. 2. Conjunctival or other eye inflammation: Conjunctivitis caused by bacteria, virus, allergy, etc., or iritis and scleritis caused by autoimmune reasons can lead to eye congestion. Antiviral, antibacterial, antiallergic eye drops or hormone, non-steroidal eye drops can be taken to treat the cause. 3. Subconjunctival hemorrhage: Subconjunctival hemorrhage caused by rubbing the eyes vigorously, coughing, sneezing, etc., may be accompanied by elevated blood pressure or abnormal coagulation function. Attention should be paid to the examination of the whole body, except whether there is high blood pressure, coagulation abnormalities, and according to the specific circumstances of the corresponding treatment and therapy. In addition, eye congestion should also pay attention to the usual eye hygiene, good eye cleaning, if there is obvious persistent redness, it is recommended to go to the hospital ophthalmology department in time for relevant examination, and follow the doctor’s instructions to use medication and treatment.