Allergy Concerns
Allergies involve the immune system reacting to normally harmless substances, evaluated per the NIAID-sponsored expert panel guidelines and American Academy of Allergy, Asthma & Immunology (AAAAI) guidance.
Symptoms
Sneezing, itchy or watery eyes, runny nose, hives, and skin reactions are common; food and drug allergies can also cause digestive symptoms, and severe reactions can involve swelling and difficulty breathing.
Causes and risk
A genetic predisposition to allergic conditions (atopy), combined with exposure to a specific allergen -- pollen, pet dander, certain foods, insect stings, or medications.
How it is evaluated
Validated testing means skin prick testing and allergen-specific IgE blood tests, always interpreted alongside the clinical history rather than in isolation, per NIAID/AAAAI guidance. A positive test alone does not confirm clinical allergy -- sensitization without symptoms is common. Food-specific IgG/IgG4 testing, hair analysis, and other direct-to-consumer allergy panels are not validated diagnostic tools.
Treatment
Intranasal corticosteroids and second-generation antihistamines are first-line for allergic rhinitis; allergen immunotherapy is an option for confirmed, specific allergies. For those at risk of severe reactions, carrying and knowing how to use an epinephrine auto-injector is essential.
When to seek care
Hives with swelling of the lips or throat, difficulty breathing, wheezing, or dizziness are signs of anaphylaxis -- a medical emergency. Use an epinephrine auto-injector if available and call 911 immediately; note that skin symptoms are absent in 10-20% of anaphylaxis cases, so their absence doesn't rule it out.