Redness of the eyes is a very common problem. In a normal state, your eyes will be red even if you rub your fingers, but they will recover quickly. However, bacteria, viruses, allergies, chemicals, or some other diseases can cause eye infections and redness, resulting in “pink eye”. In this case, it is mainly the transparent membrane above the white of the eye that is congested and edematous, and sometimes the inner side of the eyelid can have a similar problem. What we commonly call “pink eye” refers to acute khat conjunctivitis, an acute infectious eye disease that is highly contagious and can occur throughout the year, with spring and summer months being the most common. It is a rapid onset eye disease that is transmitted by contact, such as contact with the patient’s used towels, face washing utensils, faucets, door handles, swimming pool water, and common toys. Therefore, the disease often spreads widely in collective units such as kindergartens, schools, hospitals, and factories, causing outbreaks and epidemics. Red eyes can be repeatedly infected (such as re-exposure to the patient can also get sick), mostly for both eyes successively, early in the disease, the patient feels fever, burning, photophobia, eye redness, foreign body sensation, followed by eyelid redness, secretions, tearing, etc., when you get up in the morning, the eyelid is often stuck by the secretions, not easy to open. Red eyes generally do not affect vision. If a large amount of mucous-purulent secretion adheres to the corneal surface, there can be temporary blurred vision, and once the secretion is wiped away, vision can be clear. If a bacterial or viral infection affects the cornea, photophobia, tearing, and pain may increase, and vision may decrease to some degree. Is pink eye contagious? Infectious pinkeye is highly contagious. It can be easily transmitted through person-to-person contact or by sharing items with an infected person. Coughing and sneezing are other possible routes of transmission. Children with pink eye need to stay home and spend as little time as possible at school or daycare. Red eyes caused by allergic reactions or chemical exposure are not contagious. How is pink eye diagnosed? Red eye can usually be diagnosed based on typical signs and symptoms. In some cases, a slit lamp examination is required. In some patients, the discharge is removed and sent to a laboratory for examination to determine the type of infection. Red eye is more than just red eyes! Chronic conjunctivitis can be a sign of certain underlying medical conditions. The most common are rheumatic diseases, including rheumatoid arthritis and lupus erythematosus. Red eyes can also be associated with Kawasaki disease (a rare disease that causes fever in infants and children) and inflammatory bowel diseases such as Crohn’s disease and ulcerative colitis. Warm tips, spring season, red eye epidemic, we pay attention to do their own prevention: diligent hand washing, not rubbing eyes, immediately after contact with red-eye patients to wash their hands, disinfection of items after use in a timely manner, the emergence of problems in a timely manner to go to the hospital.