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Conjunctivitis, often called pink eye, is an inflammation of the conjunctiva — the thin tissue lining the white of the eye and the inside of the eyelids. It can develop due to viruses, bacteria, allergens, or irritants such as smoke or chemicals. Viral and bacterial forms are highly contagious and can spread through contact with infected secretions or contaminated surfaces.

Common symptoms include redness, itching, watery eyes, a gritty feeling, and discharge, which may appear yellow or green in bacterial infections. Allergic conjunctivitis, usually triggered by things like pollen, tends to cause itching, watery eyes, and swelling.

Treatment varies depending on the cause. Viral conjunctivitis often clears on its own, while bacterial conjunctivitis may need assessment and treatment from a medical practitioner.