Allergic conjunctivitis

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Summary

Allergic conjunctivitis is the inflammation of the eye caused by an allergic reaction.
Common symptoms include itchy, red, and watery eyes.
Treatment often involves antihistamine eye drops or pills to relieve symptoms.

Allergic conjunctivitis: essential info
Causes
What are my options?
FAQ

Reviewed on February 16, 2026. by

Dr Alexandra Cristina Cowell

Writer & Clinical Content Reviewer

Next review due on February 16, 2029

Last updated on February 16, 2026

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Olopatadine hydrochloride

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Daily eye drops that contain an antihistamine. Reduces itchiness and inflammation.

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Antihistamine eye drops to relieve allergic conjunctivitis. Generic version of Optivar.

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What causes allergic conjunctivitis?

Allergic conjunctivitis occurs when your immune system interacts with something it’s sensitive to, and it brings on the symptoms that are associated with the condition as a reaction.

Some of the more common types of allergy that cause allergic conjunctivitis are hay fever, dust mites, allergies to animals or pets (which can be caused by their hair and dander) and allergies to cosmetics and skincare.

What are the symptoms of allergic conjunctivitis?

The main symptoms of allergic conjunctivitis are:

itchy eyes which may feel gritty;
watery eyes;
red and inflamed skin inside your eyelids;
a pink tinge on the whites of your eyes (redness caused by inflammation);
a stinging and burning sensation in your eyes (but they shouldn’t feel painful); and:
swollen eyelids (in more severe cases your eyelids may look lumpy).

Can allergic conjunctivitis lead to other problems?

Allergic conjunctivitis shouldn’t lead to any other complications. It’s always worth seeking out some medical advice if it’s the first time you’ve ever experienced it though, to make sure it’s diagnosed properly and that you get the right treatment.

Even though it might be really itchy, it’s important to remember not to rub your eyes while you’re waiting for diagnosis and undergoing treatment. This will minimize discomfort and also prevent any damage to your eyes.

If you’ve had treatment for allergic conjunctivitis and it hasn’t resolved, the best course of action is to talk to a doctor to make sure there are no other underlying causes. Similarly, if you develop issues with blurry or cloudy vision, it’s best to get medical advice right away as allergic conjunctivitis shouldn’t cause issues with your sight.

Treated trusted source:

Patient.info. (n.d.). Allergic Conjunctivitis: Causes, Symptoms, and Treatment.

This page was medically reviewed by Dr Alexandra Cristina Cowell on February 16, 2026. Next review due on February 16, 2029.

How we source info.

When we present you with stats, data, opinion or a consensus, we’ll tell you where this came from. And we’ll only present data as clinically reliable if it’s come from a reputable source, such as a state or government-funded health body, a peer-reviewed medical journal, or a recognised analytics or data body. Read more in our editorial policy.

What medications are there for allergic conjunctivitis?

The first-line treatment for allergic conjunctivitis is usually antihistamines, often in the form of eye drops or pills. They’re very effective and work quickly to help minimize symptoms.

Some people might also be prescribed steroid treatment called corticosteroids. They’re not prescribed quite as often as they can have more serious side effects. They also tend to only be given in more severe cases when other treatments haven’t worked as well, or the condition keeps recurring.

Mast cell stabilizers are also used in the form of eye drops.^[1] They need to be used quite frequently (up to four times a day) and take slightly longer to work but are still very effective.

Is there a ‘best’ treatment for allergic conjunctivitis?

There’s no ‘one size fits all’ approach to treating allergic conjunctivitis and it will largely depend on your symptoms and what’s right for you.

Antihistamine treatments such as tablets and eye drops will often also help with any other allergic symptoms you might have. For example, hay fever symptoms.

If you know you may be exposed to an allergen that will cause a flare-up of allergic conjunctivitis in advance, such as visiting someone who has a pet you’re allergic to, you can take one of the treatments that contain mast cell stabilizers before you go to help your immune system.

If you experience repeated, severe flare-ups of allergic conjunctivitis, the best course of action might be to take steroid treatment.

Does allergic conjunctivitis always need treatment?

You can reduce your chances of getting allergic conjunctivitis by finding out which particular allergen sets it off and then avoiding exposure to it. For example, if you know there’s a particular cosmetic or makeup product you use that causes a flare-up, it may be best to look for a new one and patch test it.

To treat allergic conjunctivitis at home, you can use cold compresses on the eyes to help with symptoms. It can also help not to rub the eyes at all and if you wear contact lenses, it’s best to avoid wearing them and wear glasses instead until it clears.

Treated trusted source:

Castillo, M., et al. (2015). Topical antihistamines and mast cell stabilisers for treating seasonal and perennial allergic conjunctivitis. Cochrane Database of Systematic Reviews, CD009566.

How we source info.

Allergic conjunctivitis: FAQ

Have something specific you want to know? Search our info below, or ask our experts a question if you can’t find what you’re looking for.

How is allergic conjunctivitis diagnosed?

Answer:

It’s usually diagnosed by examining the symptoms you have and then checking up on your medical history to see if you have any past history of allergies or hay fever.

There are other forms of conjunctivitis that can occur, and they’ll need to be ruled out before you’re given a diagnosis of allergic conjunctivitis.

Are there different types of conjunctivitis?

Answer:

There are several different forms of conjunctivitis, it's usually caused by either infection or allergy. The most common infections are bacterial and viral:

bacterial conjunctivitis - this is often caused by exposure to germs like Staphylococcus and Streptococcus, and it’ll need antibiotics in the form of eye drops or ointments to treat it. This type of conjunctivitis can be spread from contact with an infected person who might have a sinus or ear infection.

viral conjunctivitis - this often occurs as a side effect from having a respiratory virus like the common cold, RSV (Respiratory Syncytial Virus) or even measles. While it can feel and look unpleasant, the good news is that this form of conjunctivitis will disappear on its own often, though not always, without the need for treatment and won’t need antibiotics. Eye drops and antihistamines are usually the best treatments for it.

Are there tests for allergic conjunctivitis?

Answer:

There are no tests to diagnose allergic conjunctivitis specifically. It’s usually best to look at the patient’s eyes and find out about their symptoms. You’ll be referred for tests with a specialist if there is any chance it might be a more serious condition.

Can you get side effects from allergic conjunctivitis treatment?

Answer:

Any side effects from treatments for allergic conjunctivitis, such as antihistamines, will be mild and short-lived. You can sometimes have a dry mouth or feel a bit drowsy. Eye drops used for treatment can sometimes cause a burning or stinging sensation in the eye, but this normally passes quickly.

Does allergic conjunctivitis treatment always work?

Answer:

Treatments used for allergic conjunctivitis can ease any symptoms you have and reduce any allergic reaction, meaning that the length of time an episode of allergic conjunctivitis lasts can be greatly reduced.

However, they won’t cure your allergy. Your immune system can sometimes react to the same allergen again, causing the symptoms of allergic conjunctivitis to flare up in the future.

Is allergic conjunctivitis contagious?

Answer:

No, unlike bacterial or viral conjunctivitis (also called pink eye), allergic conjunctivitis is not contagious. That’s because while the other types of conjunctivitis are caused by an infection, allergic conjunctivitis is an inflammatory eye condition caused by an overreaction of your immune system to certain triggers.

Can allergic conjunctivitis be in one eye?

Answer:

Yes, but allergic conjunctivitis in one eye is rare. It usually happens when only one of your eyes is exposed to the allergen that’s causing the allergic reaction.

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