All diseases with red eyes are not necessarily acute conjunctivitis. There are many diseases that can cause red eyes, and the symptoms of red eyes have to be differentiated. For example, in acute conjunctivitis, the eyes are covered with red blood; if there is subconjunctival hemorrhage, the eyes will also be red, but this redness is a patch of redness, and the red blood is not visible, so it is important to differentiate. Of course, if you stay up late at night, your eyes will be covered with a lot of red blood the next day. Not all diseases with red eyes are necessarily acute conjunctivitis, but also with the help of other manifestations, such as whether there is a lot of discharge, foreign body sensation, itchy eyes, photophobia, tearing and other symptoms. If you can’t figure out what’s going on, it’s still recommended to come to the hospital for prompt diagnosis and treatment.