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How do antihistamines treat allergies?

ANSWER

Histamine is a chemical your body makes when you come into contact with an allergen. It has been linked to migraine. Antihistamines will briefly stop your body from making histamine and should lessen your allergy symptoms -- but it won’t be able to ease a migraine headache if one starts.

SOURCES:

Current Neurology and Neuroscience Reports : “Allergic Rhinitis and Chronic Daily Headaches: Is There a Link?”

American Migraine Foundation: “Sinus Headaches," “Sinus Headaches, Allergies, Asthma, and Migraine: More Than a Casual Relationship?”

Annals of Allergy, Asthma & Immunology : “Prevalence of migraine headaches in patients with allergic rhinitis.”

News Release, University of Cincinnati Academic Health Center.

American College of Allergy, Asthma & Immunology: “Allergy Headaches.”

NHS Choices: “Sinusitis.”

Nemours KidsHealth: “Histamine.”

Headache : “Allergy and Immunotherapy: are they related to migraine headaches?” “Histamine in migraine and brain.”

National Headache Foundation: “Steroid Nasal Spray May Be Migraine Trigger.”

American Academy of Allergy Asthma & Immunology: “Indoor Allergens,” “Outdoor Allergens.”

Swedish Covenant Hospital: “Five diet changes to reduce seasonal allergies.”

UpToDate: “Patient Education: Allergic Rhinitis (seasonal allergies) (Beyond the Basics).”

Reviewed by Stephen D. Silberstein on July 17, 2017

SOURCES:

Current Neurology and Neuroscience Reports : “Allergic Rhinitis and Chronic Daily Headaches: Is There a Link?”

American Migraine Foundation: “Sinus Headaches," “Sinus Headaches, Allergies, Asthma, and Migraine: More Than a Casual Relationship?”

Annals of Allergy, Asthma & Immunology : “Prevalence of migraine headaches in patients with allergic rhinitis.”

News Release, University of Cincinnati Academic Health Center.

American College of Allergy, Asthma & Immunology: “Allergy Headaches.”

NHS Choices: “Sinusitis.”

Nemours KidsHealth: “Histamine.”

Headache : “Allergy and Immunotherapy: are they related to migraine headaches?” “Histamine in migraine and brain.”

National Headache Foundation: “Steroid Nasal Spray May Be Migraine Trigger.”

American Academy of Allergy Asthma & Immunology: “Indoor Allergens,” “Outdoor Allergens.”

Swedish Covenant Hospital: “Five diet changes to reduce seasonal allergies.”

UpToDate: “Patient Education: Allergic Rhinitis (seasonal allergies) (Beyond the Basics).”

Reviewed by Stephen D. Silberstein on July 17, 2017

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