How Common Are Aspirin Allergies?
True aspirin allergies, involving IgE-mediated hypersensitivity, affect about 0.2-0.5% of the general population.[1][2] More broadly, aspirin sensitivity or intolerance—often manifesting as respiratory symptoms, hives, or anaphylaxis in aspirin-exacerbated respiratory disease (AERD)—occurs in 0.3-2% of people without asthma and up to 20% of those with asthma or chronic rhinosinusitis with nasal polyps.[1][3]
Who Gets Aspirin Sensitivity Most Often?
Asthma patients face the highest risk, with AERD prevalence at 7-20% among adults with asthma.[3][4] It's rarer in children (under 1%) and more common in women aged 30-50.[2][5] Those with nasal polyps have a 10-30% chance.[4]
What Symptoms Distinguish Allergy from Intolerance?
Allergic reactions include hives, swelling, or anaphylaxis within minutes to hours.[1] AERD triggers nasal congestion, wheezing, and low blood pressure, often delayed by 30 minutes to 3 hours.[3] Cross-reactivity with other NSAIDs like ibuprofen affects 80-90% of sensitive individuals.[2]
How Do Doctors Test for It?
Oral aspirin challenge remains the gold standard, done in controlled settings.[1][5] Skin prick tests lack sensitivity for AERD but help confirm IgE allergies.[2] Basophil activation tests are emerging but not routine.[5]
What Happens If You Ignore It?
Untreated reactions can lead to severe asthma attacks or anaphylaxis, with AERD linked to worse lung function and more sinus surgeries.[3][4] About 3-5% of AERD cases progress to life-threatening events without avoidance.[4]
Treatment and Avoidance Options
Strict NSAID avoidance is key; acetaminophen is safe for most (90%).[1][2] Desensitization protocols allow tolerated dosing for AERD, with 80% success long-term via daily aspirin.[3][5] Biologics like dupilumab reduce AERD severity by 60% in trials.[4]
Why Is True Allergy So Rare?
Most reported "allergies" are intolerances, overestimated by self-reports (up to 10% claim it, but <2% confirm).[1][2] Genetic factors like leukotriene overproduction explain AERD but not classic allergies.[5]
[1]: AAAAI Aspirin-Exacerbated Respiratory Disease
[2]: JACI Aspirin Sensitivity Review
[3]: NEJM AERD Overview
[4]: ERS Guidelines on AERD
[5]: UpToDate Aspirin Hypersensitivity