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Allergic Conjunctivitis (Eye Allergy)
Allergic conjunctivitis is inflammation of the surface of the eye caused by an allergic reaction, making the eyes red, itchy and watery. It often occurs with hay fever.
Causes & risk factors
- Allergens: pollen, dust mites, pet dander, mould
- An allergic (atopic) tendency
- Often occurs alongside allergic rhinitis
- Cosmetics or eye products in some cases
- Seasonal (pollen) or year-round (dust mites)
Common symptoms
- Itchy eyes
- Red, watery eyes
- Puffy eyelids
- Burning or gritty feeling
- Both eyes usually affected
Tests & diagnosis
- Usually diagnosed from symptoms
- Allergy testing if trigger unclear
- Eye examination to rule out other causes
- Specific IgE blood test
Treatment & management
- Avoiding known allergens where possible
- Cool compresses to soothe the eyes
- Antihistamine or anti-allergy eye drops
- Artificial tears to wash out allergens
- Treating associated hay fever
When to see a doctor urgently
- Eye pain, changes in vision or sensitivity to light — urgent care
- Thick pus or one very red, painful eye (possible infection)
- Symptoms not improving with anti-allergy treatment
- Contact lens wearers with a red, painful eye
Not a diagnosis. MedDroid gives general educational information about allergic conjunctivitis (eye allergy). It cannot examine you, diagnose or prescribe — always confirm with a qualified doctor.
Frequently asked questions
Is an eye allergy contagious?
No. Unlike infective conjunctivitis, allergic conjunctivitis is not contagious. It is a reaction to allergens like pollen or dust.
How can I tell it apart from an eye infection?
Allergy usually causes itching and affects both eyes with watery discharge, while infection often causes pus and can start in one eye. A doctor can confirm.
Explore more
Sources & further reading
- World Health Organization (WHO)
- MedlinePlus — U.S. National Library of Medicine
- Ministry of Health & Family Welfare, India
- Indian Council of Medical Research (ICMR)
Reviewed by Dr. Sanjay Anbu, MBBS. MedDroid is an AI medical assistant and can make mistakes. It provides general health information, not a diagnosis or medical advice — always consult a qualified clinician. In an emergency, contact your local emergency number immediately.