Allergic Conjunctivitis: Causes, Treatments, and What You Need to Know

When your eyes turn red, itchy, and watery—especially in spring or around pets—you’re likely dealing with allergic conjunctivitis, an inflammation of the eye’s outer layer triggered by allergens like pollen, dust, or pet dander. Also known as eye allergies, it’s not contagious, but it can feel just as annoying as an infection. Unlike bacterial or viral pink eye, this isn’t caused by germs. It’s your body overreacting to something harmless, like grass or mold spores, and flooding your eyes with histamine. That’s what makes them swell, burn, and water nonstop.

Most people reach for antihistamines, medications that block histamine to reduce allergy symptoms to calm the itch. But not all of them work the same for your eyes. Oral ones like Claritin or Zyrtec can help overall, but they don’t always reach the eyes well enough. That’s why many turn to OTC allergy meds, eye drops designed to target irritation right at the source. Look for drops with antihistamines like ketotifen or naphazoline—these give faster relief than pills alone. Still, some OTC drops contain vasoconstrictors that cause rebound redness if used too long. Know what’s in the bottle.

What makes allergic conjunctivitis worse? Contact lenses. Dusty rooms. Rubbing your eyes. Even some eye drops meant to relieve redness can backfire. And if you’re already taking meds for other conditions—like blood pressure or depression—you might not realize they’re making your eyes worse. Some drugs dry out your eyes, making them more sensitive to allergens. That’s why knowing your full medication list matters.

You don’t need to suffer through every pollen season. Simple steps like washing your face after being outside, using air purifiers, and keeping windows closed can cut exposure. Cold compresses help more than you think. And if your eyes stay irritated for more than a week or start affecting your vision, it’s not just allergies anymore. Time to see a doctor.

Below, you’ll find real advice from people who’ve been there: how to pick the right eye drops, what OTC allergy meds actually work without drowsiness, and how to avoid common mistakes that make symptoms worse. No fluff. Just what helps—and what doesn’t.