Allergy Statistics in the US: Prevalence, Trends, and Demographics

Allergic conditions affect a substantial portion of the US population, generating measurable burdens on the healthcare system, workforce productivity, and quality of life. This page compiles prevalence figures, demographic breakdowns, and trend data drawn from named federal agencies and peer-reviewed surveillance programs. Understanding the scale of allergy burden informs both clinical decision-making and the regulatory context for allergy oversight that governs diagnosis, labeling, and treatment access.

Definition and Scope

For epidemiological purposes, the Centers for Disease Control and Prevention (CDC) defines allergic conditions as immune-mediated hypersensitivity responses to substances — allergens — that are harmless to most people. Surveillance data from the CDC's National Center for Health Statistics (NCHS) captures allergy prevalence across four primary condition categories: allergic rhinitis (hay fever), food allergy, skin allergy (including eczema and contact dermatitis), and respiratory allergy. These categories are not mutually exclusive; a single individual may carry diagnoses in two or more.

The scope of allergy in the United States is broad. According to the Asthma and Allergy Foundation of America (AAFA), more than 100 million Americans experience some form of allergy each year (AAFA Allergy Facts). The allergy resource index provides orientation to the full landscape of condition types covered across this reference network.

Allergic disease also carries distinct clinical boundaries. The CDC and the National Institute of Allergy and Infectious Diseases (NIAID) distinguish between IgE-mediated true allergic reactions and non-IgE-mediated intolerances — a distinction that affects both diagnosis coding and treatment eligibility. For a structured comparison, see the dedicated resource on allergy vs. intolerance.

How It Works: Measuring Allergy Prevalence

Federal allergy surveillance relies on three primary data collection mechanisms:

  1. National Health Interview Survey (NHIS) — An annual household survey administered by the CDC/NCHS that captures self-reported allergy diagnoses, including hay fever, food allergy, and skin allergy, across all age groups.
  2. National Health and Nutrition Examination Survey (NHANES) — Combines interview data with physical examinations and laboratory testing, including serum IgE measurements, providing objective biomarker confirmation alongside self-report.
  3. MarketScan and commercial claims databases — Used by researchers at institutions such as FAIR Health to track allergy-related diagnosis codes (ICD-10-CM J30–J39 for rhinitis; L20–L30 for dermatitis; T78 for adverse food reactions) in insured populations.

Prevalence estimates vary depending on whether the data source uses self-report, clinician diagnosis, or serologic confirmation. NHANES data consistently shows that sensitization rates — positive IgE responses on lab testing — exceed clinical diagnosis rates, meaning a portion of the sensitized population never receives a formal allergy diagnosis (NIAID Guidelines for Food Allergy Diagnosis).

Common Scenarios: Key Prevalence Figures by Condition

Allergic Rhinitis

The CDC NCHS reports that approximately 19.2 million adults and 5.2 million children in the US had been diagnosed with hay fever in the most recent NHIS cycle examined (CDC FastStats – Allergies and Hay Fever). Allergic rhinitis is the most prevalent allergic condition in the US by diagnosed case count. The seasonal allergies and allergic rhinitis pages detail trigger patterns and symptom presentation.

Food Allergy

NIAID-sponsored research published in JAMA Network Open (Gupta et al., 2019) estimated that approximately 10.8% of US adults — roughly 26 million people — have a food allergy, with shellfish (2.9%), milk (1.9%), and peanut (1.8%) as the three most prevalent adult food allergens. Among children, the prevalence is approximately 7.6% according to the same dataset. Food allergies and the associated food allergy labeling laws page cover the regulatory framework under FALCPA and FASTER Act.

Skin Allergy

According to CDC NCHS data, skin allergy affected approximately 10.1 million children and 21.6 million adults in a recent survey year (CDC FastStats – Allergies and Hay Fever). Eczema and atopic dermatitis and skin allergies and contact dermatitis are the dominant subtypes within this category.

Anaphylaxis

The AAFA estimates that anaphylaxis — the most severe allergic reaction — sends approximately 200,000 Americans to the emergency department each year (AAFA Anaphylaxis). Food triggers account for the largest share of anaphylaxis fatalities. The anaphylaxis page and the epinephrine auto-injectors resource detail emergency response protocols and device access.

Decision Boundaries: Demographic and Trend Patterns

Age

Allergy prevalence is not uniformly distributed by age. Food allergy diagnosis peaks in childhood, with approximately 5.8 million children under age 18 affected, per CDC data. Allergic rhinitis diagnoses, by contrast, are concentrated in adults ages 18–44 (CDC FastStats – Allergies and Hay Fever). The allergies in children and allergies in adults pages present condition-specific breakdowns for each age cohort.

Sex and Race/Ethnicity

CDC NCHS data indicates that skin allergy and food allergy are reported at higher rates among female respondents than male respondents. Allergic rhinitis prevalence is higher among non-Hispanic white populations compared to Hispanic and non-Hispanic Black populations in self-report surveys, though sensitization studies using serum IgE testing suggest biological sensitization rates differ less sharply than diagnosis rates — a gap attributed in part to differential healthcare access.

Atopic Comorbidity

A clinically important boundary concerns co-occurring atopic conditions. The allergy and the atopic march page documents the developmental sequence in which atopic dermatitis in infancy frequently precedes allergic rhinitis and allergic asthma. Approximately 60% of children with moderate-to-severe atopic dermatitis develop asthma, according to estimates cited by the National Eczema Association and consistent with NIAID-supported research frameworks.

Trend Direction

Across all major allergy categories, surveillance programs document rising prevalence over the past three decades. The hypotheses most examined in peer-reviewed literature — the hygiene hypothesis, microbiome diversity, and dietary antigen timing — are active research areas tracked by the NIAID and the American Academy of Allergy, Asthma & Immunology (AAAAI). The allergy research and advances page synthesizes current investigational directions.

References

The law belongs to the people. Georgia v. Public.Resource.Org, 590 U.S. (2020)