Sudden redness of the eyes may be caused by foreign objects entering the eyes, local trauma, acute iridocyclitis and other reasons.
1. Foreign objects in the eye: foreign objects such as eyelashes, sand and dust enter the eye and stimulate the conjunctiva to become congested and edematous, which is manifested as a sudden redness of the eye.
2. Local trauma: the eye is hit by external force can cause subconjunctival hemorrhage, the eye will be red, pain and other symptoms in a short period of time after the trauma.
3. Acute iridocyclitis: patients mostly due to surgery, infection, immunity and some diseases caused by inflammation of the iris and ciliary body, acute iridocyclitis can lead to redness of the eye in a relatively short period of time, and photophobia, pain and other symptoms.
Sudden redness of the eyes may also be due to other reasons, if it cannot be relieved after a period of time, it is recommended to go to the hospital for clarification and treatment by a professional doctor.