Allergic Conjunctivitis: Itchy, Watery Eyes and How to Get Relief
Written by Cherlie Joseph, MSN, FNP-BC · Medically reviewed by Naurah Gaspard, DNP, FNP-C, FNP-BC · Updated November 2026
Allergic conjunctivitis is inflammation of the clear lining of the eye caused by pollen, dust mites, pet dander or mold. The hallmark is itching in both eyes, usually with watery discharge and puffy lids. It is not contagious, and antihistamine eye drops such as olopatadine or ketotifen usually bring relief within minutes.
In this guide
What allergic conjunctivitis is (and isn't)
Your conjunctiva is the thin, clear membrane that covers the white of the eye and the inside of the eyelids. When an allergen lands on it, immune cells called mast cells release histamine. That causes the classic triad: itching, redness and tearing.
Unlike viral or bacterial pink eye, allergic conjunctivitis does not spread to other people. You do not need to stay home from work, and antibiotics will not help. There are two main types:
- Seasonal: flares with pollen. In Florida, tree pollen (especially oak) peaks in late winter and spring, grasses in summer and ragweed in the fall.
- Perennial: year-round symptoms from dust mites, pet dander or indoor mold, which Florida's humidity tends to encourage.
Allergic vs viral vs bacterial pink eye
The pattern of symptoms is usually the best clue:
| Feature | Allergic | Viral | Bacterial |
|---|---|---|---|
| Main symptom | Intense itching | Gritty, burning | Sticky, crusted lids |
| Eyes affected | Usually both at once | Often one, then the other | One or both |
| Discharge | Clear, watery or stringy | Watery | Thick yellow or green |
| Other clues | Sneezing, runny nose | Recent cold | Lids stuck shut in the morning |
| Contagious? | No | Yes | Yes |
If you are not sure which one you have, an online visit can help sort it out so you use the right treatment.
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A Cochrane review of topical antihistamines and mast cell stabilizers found these drops reduce itching and redness better than placebo. The most useful options:
- Dual-action antihistamine/mast cell stabilizer drops: olopatadine (Pataday) and ketotifen (Zaditor, Alaway) are available over the counter. They work quickly and also help prevent the next flare when used daily during your season. Alcaftadine (Lastacaft) is another once-daily option now sold without a prescription.
- Preservative-free artificial tears: rinse pollen off the eye surface. Keeping them in the refrigerator makes them more soothing.
- Prescription drops: for stubborn symptoms, a provider may suggest other antihistamine drops or, for a short time, a mild steroid drop. Steroid eye drops can raise eye pressure and should only be used under supervision.
Avoid relying on "get the red out" decongestant drops (such as naphazoline or tetrahydrozoline). They shrink blood vessels for a few hours, but frequent use can cause rebound redness.
Home care that actually helps
- Don't rub. Rubbing releases more histamine and makes itching worse.
- Cool compresses for 5 to 10 minutes calm swelling.
- Rinse off pollen: shower and wash your hair at night during high-pollen days, and wash pillowcases often.
- Keep windows closed and run the AC with a good filter. Florida's AC season is long, so change filters on schedule.
- Contact lens wearers: switch to glasses during flares or use daily disposables, and remove lenses before most drops unless the label says otherwise.
- Treat the nose too: an oral antihistamine or steroid nasal spray can ease eye symptoms when you also have hay fever. Oral antihistamines can dry the eyes, so drops are often still needed.
When to see a provider
Start an online visit if your eyes are not better after a few days of over-the-counter drops, symptoms keep coming back every season, or you are unsure whether it is allergy or infection. A provider can review your history, recommend a prevention plan for your season and prescribe stronger drops if appropriate. Anyone with eye pain, light sensitivity or vision changes needs an in-person eye exam, since those are not typical of allergies.
Get in-person care or call 911 if you have:
- Eye pain (not just itching) or strong sensitivity to light
- Blurred vision that does not clear with blinking
- A chemical splash or injury to the eye
- Swelling and redness spreading around the eye with fever
- Severe allergic reaction with throat swelling or trouble breathing (call 911)
Frequently asked questions
Is allergic conjunctivitis contagious?
No. Allergic conjunctivitis is a reaction to allergens, not an infection, so it cannot spread to other people. You can go to work or school.
How long does allergic conjunctivitis last?
It lasts as long as you are exposed to the trigger. Seasonal symptoms can last weeks to months during pollen season. Daily antihistamine/mast cell stabilizer drops can keep symptoms under control during that time.
Can allergies cause pink eye in just one eye?
It is uncommon. Allergic conjunctivitis usually affects both eyes. Symptoms in one eye, especially with thick discharge or pain, suggest another cause and should be checked.
Sources
- Cochrane: Topical antihistamines and mast cell stabilisers for allergic conjunctivitis
- American Academy of Ophthalmology: Conjunctivitis (pink eye)
- FDA: What you should know about eye drops
Keep reading
- How long is pink eye contagious?
- Pink eye treatment online
- Sinus infection or Florida allergies?
- Browse all conditions and treatments A to Z
Itchy, red eyes that won't quit?
$79 visit, no appointment needed. Adults 18+ in FL, NM, OR and WA.
Start a pink eye visit →
Cherlie Joseph, MSN, FNP-BC
Board-certified family nurse practitioner licensed in Florida, caring for adults online at OurTopClinic. Meet our providers.
This article is for general education and is not a substitute for medical advice. Treatment, including any prescription, is decided by a licensed provider after reviewing your health history. OurTopClinic is not for emergencies; if you have a medical emergency, call 911. OurTopClinic serves adults located in Florida, New Mexico, Oregon and Washington. Learn more at ourtopclinic.com.
