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A 27-year-old member asked:

Why do allergies make my eyes water?

2 doctor answers13 doctors weighed in
Dr. Sean McGhee
Allergy and Immunology 24 years experience
Immune reactions: The conjunctiva, the thin membrane on the inner surface of the eyelids and the white part of the eye, has lots of mast cells, which are the cells that react to allergens. So just as you get an allergic reaction in the nose, you get an allergic reaction in the eye as well. The eye is also connected to the nose through a small duct, and sometimes allergens can travel back and forth.
Dr. Paul Carter
A Verified Doctoranswered
31 years experience
Histamine: Histamine acts directly on the eye to cause redness, swelling, itching, and tearing. There is also an effect through histamine causing nasal symptoms like itching which in turn can cause tearing in the eye through the naso-ocular reflex.

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Memphis, TN
A 31-year-old female asked:

Why do my eyes constantly water when I have a cold or allergy attack?

2 doctor answers2 doctors weighed in
Dr. Mark Loury
ENT and Head and Neck Surgery 40 years experience
Nerve interaction: There are connections between the nasal sensory nerves and the lacrimal glands that produce tears. Therefore anything that irritates or inflames the nose induces tear production. That explains the reduced tearing when nasal steroids are used to treat allergy. The steroids reduce the allergy response and nasal inflammation with less tearing. Oral and topical antihistamines will reduce itching.
Last updated Feb 6, 2019
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