Allergic Rhinitis (Hay Fever): Causes, Testing & Treatment

Written by Empire Medical Training Editorial Team

Medically reviewed by Sherry Wehner, MD Board-Certified Pathologist & Dermatopathologist; Aesthetic & Wellness Medicine

Updated June 2026 ·10 min read

Allergic rhinitis is allergic inflammation of the lining of the nose, and it is the condition most patients are describing when they walk in and say they have allergies. It is also, by a wide margin, the most common allergic disease. Roughly 30% of American adults have environmental allergies, and the nose is where most of them feel it — sneezing, congestion, a runny or itchy nose, and the watery, itchy eyes of allergic conjunctivitis that so often travels with it. For a primary-care or aesthetics practice, it is also one of the highest-yield conditions to be able to test for and treat well.

This guide sits within Empire's Allergy Testing & Treatment resource center and is written for clinicians who want an accurate, practical overview. It is clinical education, not medical advice, and nothing here should be read as a treatment protocol, dosing schedule, or substitute for individualized clinical judgment.

What is allergic rhinitis?

Allergic rhinitis is a hypersensitivity reaction that occurs when a patient is exposed to an antigen they are sensitized to — in this case an inhaled allergen contacting the lining of the nose. The classic allergic symptoms clinicians associate with this process — conjunctivitis, sinusitis, rhinitis, eczema, and asthma — cluster together for a reason: they share the same underlying immune mechanism, and a patient with one often has others.

Like nearly all allergic disease, allergic rhinitis is multifactorial, shaped by genetics, environment, and immunology together. Genetics weigh heavily: a child with one allergic parent is roughly 30–50% more likely to develop allergies, and with two allergic parents that rises to 60–80%. That family history is one of the first things to ask about, because it reframes a vague complaint of “constant congestion” as a probable allergic process worth testing.

The IgE and histamine mechanism

The reason allergic rhinitis feels the way it does comes down to the allergic cascade. At its center is the mast cell. In a sensitized patient, the offending antigen binds to IgE receptors on the mast cell, which triggers degranulation and the release of inflammatory mediators — the most important being histamine.

Histamine is what produces the symptoms a patient can actually describe. It drives nerve stimulation, which causes the itching; vasodilation, which causes the redness; and endothelial gapping of the blood vessels, which causes the swelling. Other mediators — prostaglandins, tryptase, and heparin — add to that endothelial leak and swelling. In the nose, that translates directly into the familiar picture: congestion from swollen, leaky nasal tissue; rhinorrhea from the watery secretions; sneezing and itch from nerve stimulation; and the red, itchy, watering eyes when the same process hits the conjunctiva. Understanding this cascade is also why the treatment ladder is built the way it is — antihistamines blunt one mediator, while intranasal corticosteroids dampen the whole inflammatory response. For a deeper look at the mediator biology, see histamine and the allergic response.

Seasonal vs perennial allergic rhinitis

Clinically, it helps to sort allergic rhinitis by when it happens, because the timing points straight at the trigger and at the testing panel you'll want.

• Seasonal allergic rhinitis — the “hay fever” pattern — is driven by outdoor allergens that appear at certain times of year, chiefly mixed grasses and spring trees, along with weed pollens. Symptoms wax and wane with the pollen calendar, and the specific culprits vary by region. Empire's regional context matters here: which grasses and trees dominate depends heavily on where in the country the patient lives, which is also why allergy test panels are tailored to geography.
• Perennial allergic rhinitis is driven by year-round indoor allergens — most commonly house dust mites, along with mold and fungi (Aspergillus, Alternaria, Cladosporium) and animal allergens such as cat dander, dog, and other pets. Because the exposure never stops, symptoms persist all year and are easy to mistake for “chronic sinus problems” rather than allergy.

Many patients have both — a year-round baseline of dust-mite or pet symptoms with seasonal pollen flares layered on top. A thorough environmental allergy history that covers the home (pets, carpet, clutter), the work environment, and the timing of symptoms is what separates these patterns and guides which allergens to test.

Symptoms and overlap with sinusitis

The core symptoms of allergic rhinitis are familiar: sneezing, nasal congestion, clear rhinorrhea (runny nose), nasal and palatal itching, postnasal drip, and itchy, watery eyes. The ocular component — allergic conjunctivitis — is common enough that many patients describe their eyes as the worst part. Postnasal drip frequently produces throat clearing and cough, and disrupted sleep is one of the most underappreciated consequences (more on that below).

Where this gets clinically muddy is the overlap with sinusitis. Allergic rhinitis and sinusitis share so much of the same picture — congestion, drainage, pressure — that they're often lumped together as “sinus problems,” and the diagnostic codes that justify allergy testing reflect that reality, spanning allergic rhinitis, chronic rhinitis, and chronic sinusitis. The practical point is mechanistic: allergic rhinitis is the IgE-driven inflammation that, by causing chronic nasal swelling and obstructed sinus drainage, can predispose a patient to recurrent sinusitis. Treating the underlying allergy is therefore often part of breaking a cycle of repeated “sinus infections.” The honest caveat is that not all rhinitis is allergic — vasomotor and other non-allergic rhinitis exist — which is exactly why diagnosis rests on history correlated with testing rather than symptoms alone.

How allergic rhinitis is diagnosed

Diagnosis is never the test alone — it is clinical history correlated with allergy testing. The history does most of the work: family history of allergies, the patient's own sense of their triggers, the home environment (pets, carpet, clutter), the work environment and any chemical or irritant exposures, dietary factors, and above all the timing of symptoms. That timeline is what distinguishes a seasonal pollen pattern from a perennial dust-mite one before a single test is run.

Testing then identifies the specific culprits. Two validated tools are used:

• Skin-prick testing is the most widely used because it is fast, inexpensive, and gives visible results within about 15 minutes — a wheal-and-flare reaction read against positive and negative controls. It is the usual first-line test for suspected allergic rhinitis. It can be performed while a patient continues inhaled nasal steroids, but antihistamines must be stopped for several days beforehand or the test will read falsely negative. See skin testing for allergies for how it works.
• Specific-IgE blood testing measures allergen-specific antibodies in vitro. It is the alternative when skin testing isn't possible — for patients on medications that can't be safely stopped, those with extensive eczema or dermatographism, or young children. See blood testing for allergies.

Neither test is a stand-alone diagnosis. A positive result only matters if it correlates with the patient's history — the goal is to confirm what the story already suggests, not to fish for incidental sensitizations. The exact testing technique, the controls, how to read a wheal, and the documentation are taught hands-on in Empire's course.

The treatment ladder, honestly

Management of allergic rhinitis follows a sensible ladder, and being candid about what each rung actually does keeps expectations realistic.

Avoidance

Reducing exposure is the logical first step and costs nothing — dust-mite encasements, removing or limiting pet exposure, managing indoor humidity to control mold, and tracking the pollen calendar. Avoidance helps but is rarely sufficient on its own, especially for ubiquitous allergens like dust mites or for patients unwilling to part with a pet.

Intranasal corticosteroids (first-line)

For most patients with persistent or moderate-to-severe symptoms, intranasal corticosteroids are the single most effective first-line therapy. They suppress the whole inflammatory cascade rather than blocking one mediator, which is why they outperform antihistamines for nasal congestion in particular. A practical bonus for testing practices: inhaled nasal steroids do not interfere with skin-prick test results, so a patient can stay on their nasal spray while being worked up.

Antihistamines

Oral and intranasal antihistamines directly counter the histamine-driven itch, sneezing, and rhinorrhea, and they work well for milder or intermittent symptoms. The crucial caveat for any practice that tests: antihistamines must be discontinued for roughly four to five days before skin-prick testing, because taking them produces false-negative results. Counsel patients on this at scheduling, not on the day of the test.

Immunotherapy (disease modification)

Everything above controls symptoms; only immunotherapy modifies the disease. Subcutaneous immunotherapy (SCIT) — what patients call “allergy shots” — gradually desensitizes the immune system to specific environmental allergens. It is not a cure, but it can dramatically reduce symptoms and improve quality of life, and it is appropriate for patients with three or more positive environmental allergens on testing. Sublingual immunotherapy (SLIT) is more convenient but less effective and, for compounded drops, largely off-label. The full comparison lives in allergy immunotherapy; the science and supervised technique are taught in Empire's course.

Quality of life, sleep, and asthma

It is easy to dismiss allergic rhinitis as a nuisance, but its impact on quality of life is real and measurable. Chronic congestion and postnasal drip fragment sleep, and poor sleep drives daytime fatigue, reduced concentration, and diminished work and school performance. Patients who have lived with year-round symptoms often don't realize how much function they've lost until effective treatment gives it back — which is part of what makes treating this condition so rewarding.

There is also a direct link to the lower airway. Allergic rhinitis and asthma share the same underlying allergic inflammation, and uncontrolled upper-airway allergy is associated with worse asthma control — the “one airway” concept. Allergy care supports asthma management but does not replace it; asthma is a serious condition requiring proper medical management, and patients with uncontrolled asthma are among those best referred to a specialist. See asthma and allergies for how the two connect.