Allergic Conjunctivitis
Informed by recognized medical guidance
Overview
Allergic conjunctivitis is an eye condition where the thin, clear layer over the white part of your eye (the conjunctiva) becomes red and swollen because of an allergy. It happens when your eyes come into contact with something you are allergic to, like pollen or pet fur.
Key facts
- It is not contagious, so you cannot catch it from someone else.
- It usually affects both eyes and can feel very itchy.
- It is often seasonal, but some people have symptoms all year round depending on the trigger.
Yes, allergic conjunctivitis is very common. Many people get it at some point, especially during hay fever season.
It can affect people of all ages, but it is especially common in children and young adults. People who already have other allergies, such as hay fever, asthma, or eczema, are more likely to get it.
Symptoms
- Sudden loss of vision — call your local emergency number immediately.
- Severe eye pain — call your local emergency number immediately.
- Eye injury or chemical splash — call your local emergency number immediately.
- Inability to open the eye — call your local emergency number immediately.
- ⚠Symptoms that get much worse despite avoiding triggers
- ⚠Swelling that spreads beyond the eye, such as the face or lips
- ⚠Eye discharge that becomes thick and yellow or green (possible infection)
- ⚠Vision changes that do not improve after gently cleaning the eye
Common symptoms
- Red or pink eyes
- Itchy eyes (often intense)
- Watery eyes or clear discharge
- Burning or gritty feeling
- Swollen eyelids
- Sensitivity to light
Symptoms in children
- Rubbing eyes a lot
- Red and watery eyes
- Puffy eyelids
- Difficulty concentrating at school due to discomfort
Symptoms in older adults
- Dry eyes along with allergic symptoms
- More subtle redness
- Burning sensation
- Blurred vision from tear film disruption
Causes
Main causes
- Pollen from trees, grass, or weeds
- Dust mites
- Pet fur or dander
- Mold spores
- Certain eye drops or cosmetics, in some people
Risk factors
- Personal history of allergies, such as hay fever, asthma, or eczema
- Family history of allergies
- Spending a lot of time outdoors during high pollen seasons
- Being around pets or dusty environments
When to see a doctor
See a doctor urgently if:
- If you have eye pain, changes in vision, or thick discharge, seek care the same day.
- If symptoms do not improve after a few days of self-care.
Book a routine appointment if:
- If itchy, red eyes keep coming back and affect your daily life, make a routine appointment.
- If you need advice on how to manage your triggers.
Diagnosis
A doctor or eye specialist will ask about your symptoms and look at your eyes with a small light. Usually, no special tests are needed.
Tests that may be done
- A simple eye examination with a slit lamp (a magnifying device)
- Sometimes skin or blood allergy tests to find specific triggers
What to expect at your appointment
The examination is quick and painless. Your doctor will check the inside and outside of your eye and may ask about your medical and allergy history.
Treatment
Treatment focuses on relieving symptoms and avoiding the allergen. Most cases improve with simple self-care. If symptoms are more bothersome, a doctor can recommend safe treatments.
Self-care at home
- Apply a cold, damp cloth over closed eyes for 10–15 minutes to ease itching.
- Use artificial teardrops (lubricating eye drops) from the pharmacy — always follow the label.
- Avoid rubbing your eyes, as this can make symptoms worse.
- Wash your face and hands after being outdoors during high pollen times.
- Wear wraparound sunglasses outdoors to block pollen from reaching your eyes.
Medical treatments
Your doctor, pharmacist, or eye specialist may suggest anti-allergy eye drops, oral allergy medicine, or other treatments that suit your situation. Always follow their advice and never use someone else's eye drops.
When is surgery considered?
Surgery is not needed for allergic conjunctivitis.
Living with this condition
Living with allergic conjunctivitis means learning what triggers your symptoms and taking small steps to avoid them. This can help you feel more in control and reduce flare-ups.
Lifestyle tips
- Keep windows closed during high pollen seasons and use an air purifier if possible.
- Wash bedding regularly in hot water to reduce dust mites.
- Shower and change clothes after spending time outdoors.
- Keep pets out of the bedroom if you are allergic to them.
- Use sunglasses or glasses to protect your eyes outdoors.
Diet and exercise
There is no special diet for allergic conjunctivitis, but eating a balanced diet supports overall health. Exercise is fine, but try to avoid exercising outdoors when pollen counts are very high.
Mental health and emotional wellbeing
Living with itchy, uncomfortable eyes can be frustrating and may affect your mood, sleep, or focus. It is normal to feel bothered by it. If you feel anxious or low, talk to your doctor or a trusted friend.
Prevention
You cannot always prevent allergic conjunctivitis, but you can reduce how often it happens by avoiding your triggers. If you do not know your triggers, keeping a diary of your symptoms can help.
Vaccines
There is no vaccine for allergic conjunctivitis.
Screening programmes
There is no routine screening test for allergic conjunctivitis. See a doctor if you have persistent eye symptoms.
Complications
If left untreated
- Corneal damage from constant rubbing (rare)
- Secondary infection from rubbing or using contaminated eye drops
- Persistent discomfort that affects daily life
Long-term outlook
With the right care, most people find relief quickly. Avoiding triggers and following treatment advice can keep symptoms under control, and many people outgrow their allergies or find they improve over time.
Find support
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Always verify with your doctor
Health guidelines vary by country and region. The information in this article is based on international clinical guidelines but may not reflect the specific guidelines, medications, or practices in your country. Always discuss your health concerns with your own doctor or healthcare provider, and refer to your local national health guidelines where available.
Important notice This information is for educational purposes only. It does not replace professional medical advice, diagnosis, or treatment. Always consult a qualified healthcare provider about your specific situation. If you are experiencing a medical emergency, call your local emergency services immediately.
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Sources and guidance
This article is educational and is prepared with reference to recognized health information and clinical guidance sources where available. Specific source links may vary by topic.
Last updated: August 2, 2026
Educational note: This information is for education only and is not a diagnosis.
Use it to support, not replace, advice from a licensed clinician.
If symptoms are severe, worsening, or urgent, call your local emergency number or seek emergency care.