What is conjunctivitis? Is it a serious condition?
Nov 17, 2025
Source: Cainiu Health
Dr. Wang Shuai
Introduction
Conjunctivitis is mainly divided into infectious and non-infectious types. Infectious conjunctivitis is caused by pathogens such as bacteria and viruses, and may be accompanied by increased discharge and eye redness and swelling. Viral types can be contagious, but most cases improve within 1–2 weeks with appropriate use of anti-infective medications. Non-infectious conjunctivitis is mostly triggered by allergies or environmental irritants (such as wind, dust, or cosmetics).
Conjunctivitis is usually an inflammation caused by irritation or infection of the conjunctival tissue on the surface of the eye. Most types are not serious if treated promptly. If in doubt, it is recommended to seek medical advice early. Detailed analysis is as follows:
Conjunctivitis is mainly divided into infectious and non-infectious types. Infectious conjunctivitis is caused by pathogens such as bacteria or viruses, and may be accompanied by increased eye discharge and redness or swelling. Viral types can be contagious, but most cases improve within 1–2 weeks with proper use of anti-infective medications. Non-infectious conjunctivitis is mostly triggered by allergies or environmental irritants (such as dust, sand, or cosmetics). Symptoms typically resolve quickly once the irritant is removed and appropriate medication is used, and generally do not cause long-term effects on vision.
Most cases of conjunctivitis present with symptoms such as red eyes, a foreign body sensation, mild itching, or increased discharge, without significant vision loss. These cases usually recover well with timely care and treatment. In rare instances, if the inflammation spreads to the cornea or is caused by specific pathogens, symptoms such as blurred vision or severe pain may occur. Without prompt intervention, this could damage the ocular surface and requires greater attention; however, the condition can still be controlled with professional treatment.
Once symptoms of conjunctivitis appear, avoid rubbing the eyes to prevent worsening irritation or spreading infection. Seek timely evaluation from an ophthalmologist to determine the type and follow prescribed treatments. Maintain good personal hygiene and avoid sharing towels, eye drops, or other personal items with others to prevent cross-infection.
