What symptoms are typically seen in allergic conjunctivitis?

In the case of allergic conjunctivitis, the symptoms primarily manifest due to the body's immune response to allergens, leading to inflammation of the conjunctiva. Itching is a hallmark symptom because histamine release from mast cells in the conjunctiva activates itch receptors, prompting the characteristic urge to rub or scratch the eyes. Tearing frequently accompanies allergic conjunctivitis as well; this happens as a physiological response to the irritation and inflammation present in the conjunctival tissue. Increased tear production aims to flush out allergens and soothe the irritated surface.

In terms of other symptoms, while pain and swelling can occur due to secondary complications or coexisting conditions, they are not typical primary symptoms of uncomplicated allergic conjunctivitis. Similarly, photophobia and diplopia are more associated with other ocular conditions, including infections or more severe inflammations, and are not typically seen in allergic reactions isolated to the conjunctiva.