Allergies (NHS)

Tier 1: Established: peer-reviewed research or government health authority
Publisher: National Health Service · Published: August 19, 2026 · Accessed: August 19, 2026

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Claims this source supports

• Allergies are your immune system reacting to a normally harmless substance; symptoms include sneezing, a runny or blocked nose, itchy or red eyes, and hives.
• Allergy symptoms that do not respond to antihistamines, or that track a pattern other than allergen exposure, deserve a broader look - including the hormonal allergy-like symptoms of perimenopause.