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Acacia pollen is largely insect-pollinated and rarely a significant aeroallergen outside coastal California and the US Southwest.

Acacia pollen is largely insect-pollinated and rarely a significant aeroallergen outside coastal California and the US Southwest.

Acarapis woodi is an internal parasite of honeybees that lives exclusively inside bee tracheal tubes and has zero human allergy relevance.

Acarus siro, the grain mite, is the world's most common stored food mite — found in 21% of shop-bought cereal products and 38% after 6 weeks

ACE inhibitor angioedema is a bradykinin-mediated, non-IgE reaction affecting 0.1 to 0.7 percent of users, with 3 to 4 times higher risk in

ACE inhibitor angioedema affects 0.1 to 0.7 percent of users overall, with 3 to 4 times higher risk in Black patients.

Aceria anthocoptes is a microscopic eriophyid mite that feeds exclusively on Canada thistle plants and is studied as a biological weed contr

Acetaminophen allergy is rare — the vast majority of adverse reactions labeled as allergy are dose-related hepatotoxicity from NAPQI accumul

Cellulose acetate is not an allergen — it is actively recommended as a hypoallergenic eyeglass frame material for patients with nickel aller

Acremonium is a slow-growing, saprophytic mold genus found in persistently damp indoor environments such as basements, bathrooms, and HVAC s

Acrylic allergy is a Type IV delayed hypersensitivity reaction to uncured (meth)acrylate monomers — not cured acrylic products.

Aculops lycopersici is a microscopic eriophyid mite devastating tomato crops with bronze discoloration and fruit russeting.

Africanized bee allergy is not an allergy to a different venom — it is an IgE-mediated reaction to the same honeybee venom (Apis mellifera)

Reactions to aftershave are almost never a true IgE-mediated allergy but rather irritant contact dermatitis or allergic contact dermatitis f

Ailanthus pollen allergy is an immune reaction to wind-borne pollen from Ailanthus altissima, the invasive tree of heaven that dominates vac

Ailanthus pollen allergy is an immune reaction to wind-borne pollen from Ailanthus altissima, the invasive tree of heaven that dominates vac

Ajax dish soap is not hypoallergenic.

True IgE-mediated alcohol allergy is extremely rare — the vast majority of adverse reactions to alcohol are caused by enzyme deficiencies, h

Aldehyde allergy is caused by a class of reactive chemicals — formaldehyde, glutaraldehyde, glyoxal, cinnamic aldehyde (cinnamal), and benza

Alder pollen allergy is an IgE-mediated immune reaction to pollen from alder trees (Alnus species), a significant early-spring aeroallergen

Aleve (naproxen) is not hypoallergenic.

Alkali grass allergy is a seasonal immune reaction to pollen from Puccinellia spp., a Pooideae grass specialized for saline and alkaline soi

Reactions to acne treatments are overwhelmingly irritant contact dermatitis, not true IgE-mediated allergy.

Allspice pollen causes no hay fever; the real risk is eugenol contact sensitization.

Allspice pollen causes no hay fever; the real risk is eugenol contact sensitization.

Almay Oil-Free Makeup Remover Pads are marketed as hypoallergenic, but this term has no FDA regulatory definition.

Almond pollen allergy is a regionally concentrated condition primarily affecting workers in California's Central Valley, where over 80% of t

Alpaca allergy is an IgE-mediated reaction to proteins in alpaca dander, saliva, and urine — not just fiber.

Alternaria alternata is the most clinically dangerous mold allergen, carrying an adjusted odds ratio of 189.5 for asthma-related respiratory

Alternaria alternata is the sole mold species with multiple double-blind placebo-controlled trials supporting both allergy shots (SCIT) and

Aluminum allergy is a Type IV delayed hypersensitivity reaction to aluminum salts, most often triggered by aluminum hydroxide used as an adj

Aluminum salts allergy is a Type IV contact hypersensitivity reaction to aluminum compounds — most commonly aluminum chlorohydrate and alumi

American cranberrybush (Viburnum trilobum) is not an allergen — it is insect-pollinated with zero characterized allergens.

Amyl cinnamal is a synthetic jasmine-like fragrance used in perfumes and cosmetics — despite its name, it is not derived from cinnamon and h

Perioperative anaphylaxis occurs in 1 in 10,000 anesthetics, kills 3.8 percent, and is most often caused by antibiotics — not NMBAs.

Angel Soft toilet paper is effectively low-allergen in practice.

Annual beard grass allergy is an immune reaction to pollen from Polypogon monspeliensis, a Pooideae grass that has naturalized on every inha

Anti-emetic allergy is uncommon — true IgE-mediated anaphylaxis to ondansetron (Zofran) exists but is rare, and most adverse events attribut

Antiarrhythmics span the Vaughan Williams classification — sodium-channel blockers, beta-blockers, potassium-channel blockers, and calcium-c

Antibiotic allergy refers to immune-mediated hypersensitivity to any antibacterial drug, but the vast majority of reported antibiotic allerg

True anticholinergic allergy is rare — most reactions described as 'anticholinergic allergy' are pharmacologic side effects including dry mo

Heparin-induced thrombocytopenia Type II is the clinically important immune-mediated reaction to anticoagulants, affecting 0.1 to 5 percent

Anticonvulsants — particularly carbamazepine, phenytoin, phenobarbital, and lamotrigine — carry the highest severe cutaneous adverse reactio

True IgE-mediated antidepressant allergy is extraordinarily rare.

Antidiarrheal allergy is rare, but bismuth subsalicylate (Pepto-Bismol) contains approximately 130 mg aspirin-equivalent salicylate per stan

Antifungal drug allergy is an immune-mediated hypersensitivity reaction to medications used to treat fungal infections, distinct from common

Antifungal allergy encompasses four drug subclasses — azoles, polyenes, echinocandins, and allylamines — each with distinct reaction profile

Antihistamine allergy is a paradoxical condition where medications designed to treat allergic reactions themselves cause immune-mediated hyp