Red eye, also called acute or subacute bacterial or viral conjunctivitis, is contagious and highly infectious. Red eye is mainly seen in the spring and autumn seasons, can be sporadic infection, any age can develop, mainly in schools, factories and other places of collective life. The main manifestations of pink eye are: rapid onset, incubation period of only 1 to 3 days, two eyes at the same time or 1 to 2 days between the onset of inflammation, 3 to 4 days after the heaviest performance, there will be eye irritation and congestion, when you wake up in the morning, there are secretions around the eyes, the initial secretions are thin, slowly become thick or purulent, sometimes it will paste the eyes, and appear to open the eyes more Sometimes the discharge may become thick or purulent, and sometimes the eyes may become cloudy and difficult to open. Some patients also have viral infections. The presentation is partially similar to bacterial conjunctivitis, but the difference is that the patient does not have a yellow discharge, but mainly tears. Viral infections are more likely to involve the cornea, so the symptoms of foreign body sensation and photophobia are more severe than those of bacterial conjunctivitis. The main treatment is to remove the cause of the disease and anti-infection treatment, which is selected according to the condition, either topical if the conjunctiva is congested, or systemic, or a combination of medications. However, the affected eye should not be bandaged and shades can be worn to reduce the irritation of the sun on the eye. Generally, adults choose eye drops for topical treatment, while children need to choose eye ointment to avoid eye irritation caused by eye drops, and children may cry and cause aggravation of the disease. As mentioned above, pink eye (also known as acute or subacute bacterial or viral conjunctivitis) is contagious and should be treated as soon as possible if it occurs, and it is important to avoid sharing towels with family members.