When to see an allergist (and what to expect)

Most seasonal allergy sufferers manage with over-the-counter medication and never see a specialist. Some should. Here's how to know which category you're in, what actually happens at an allergist appointment, and what changes — and doesn't change — afterward.

The short answer

See an allergist if: OTC medications aren't giving adequate relief after consistent use, your symptoms are affecting sleep or daily function, you want to know specifically what you're allergic to, or you're interested in immunotherapy — the one treatment that can actually reduce or eliminate allergies rather than just manage them. You don't need a referral in most states; you can call an allergist's office directly.

When OTC management is enough

Many people manage seasonal allergies perfectly well without ever seeing a specialist. You probably don't need to see an allergist if:

• A daily second-generation antihistamine (Claritin, Zyrtec, Allegra, or generic equivalent) plus a steroid nasal spray (Flonase or equivalent) gives you acceptable symptom control
• Your symptoms are limited to defined seasons and you can predict and prepare for them
• You're not experiencing asthma, significant sleep disruption, or symptoms that interfere with work or school
• You're comfortable not knowing exactly which allergens are responsible

If that describes your situation, there's nothing wrong with staying on OTC management indefinitely. See our antihistamines guide for how to optimize what you're taking.

When to make the appointment

Consider seeing an allergist if any of the following apply:

• OTC medications aren't working. "Not working" means: you've been taking an antihistamine and a nasal steroid spray daily, consistently, for two to three weeks, and you're still significantly symptomatic. One dose of Zyrtec on a bad day is not adequate trial of OTC therapy.
• Symptoms are year-round or worsening. Seasonal allergies that persist through winter, or that are noticeably worse every year, often indicate expanding sensitivity — new allergens, or higher-grade reactions to existing ones.
• Sleep disruption. Chronic poor sleep from nasal congestion has measurable downstream effects on cognitive function, mood, and immune health. This warrants treatment beyond "try a different antihistamine."
• Asthma is part of the picture. Wheezing, chest tightness, or shortness of breath during pollen season is not just a worse version of nasal allergies — it may be allergic asthma, which requires its own treatment plan and carries genuine health risk if unmanaged.
• You want to know what you're allergic to. Self-diagnosis based on symptom timing is often accurate, but a skin test gives you a definitive answer and may identify allergens you didn't suspect.
• You want to explore immunotherapy. Allergy shots and sublingual tablets are the only treatments that can actually reduce sensitivity over time. They require specialist supervision.
• Medications you need have side effects you can't tolerate. An allergist can help optimize your regimen, prescribe prescription-only options, or move toward immunotherapy as an exit strategy from medication.

What happens at the first appointment

Medical history

The first appointment starts with a detailed history: when your symptoms started, what seasons are worst, what medications you've tried, your home environment (pets, carpets, mold history), occupational exposures, and whether anyone in your family has allergies or asthma. The allergist is building a picture of your exposure and reaction patterns before any testing.

Bring a list of every medication and supplement you're taking. Many antihistamines suppress the skin test response — your allergist will tell you which to stop taking before testing day (usually 3–7 days prior, depending on the drug). Flonase and other nasal steroids don't need to be stopped.

Skin-prick testing

Skin testing is the most common and most accurate way to identify specific allergen sensitivities. The standard method is the skin-prick test: a nurse applies small drops of purified allergen extracts to your forearm or upper back, then makes a small superficial scratch through each drop with a lancet. It doesn't draw blood — it feels like a light fingernail scratch.

After 15–20 minutes, the nurse measures any raised, reddened welts (called "wheals") that have formed at specific allergen sites. A weal of 3mm or more is generally considered a positive reaction. A standard panel covers:

• Regional trees (typically 10–20 species based on your local flora)
• Grasses (Timothy, Kentucky bluegrass, Bermuda, and others)
• Weeds (ragweed, mugwort, pigweed, and others)
• Molds (Alternaria, Cladosporium, Aspergillus)
• Indoor allergens (dust mites, cat, dog, cockroach)

The whole process takes about 30–45 minutes. Results are immediate — by the end of the appointment you'll know your specific sensitization profile.

Intradermal testing (if needed)

If skin-prick results are ambiguous or negative but clinical history strongly suggests allergy, the allergist may perform intradermal testing — a small injection of diluted allergen into the skin. This is more sensitive but less specific than the skin-prick method, and it's usually reserved for venom (bee, wasp) and drug allergy evaluation rather than routine inhalant testing.

Alternative: blood testing

Specific IgE blood tests (sometimes called RAST or ImmunoCAP tests) measure antibody levels in your blood against individual allergens. They can be ordered by any physician — including your primary care doctor — without a referral to a specialist.

Blood tests are useful when skin testing isn't possible (severe eczema covering the test area, inability to stop antihistamines, very young children). They're somewhat less sensitive than skin testing for identifying low-grade sensitivities, and results take days rather than the immediate read of a skin test. For straightforward seasonal pollen allergy, most allergists prefer skin testing when they can do it.

What changes after testing

The most practical outcome of testing is a targeted medication and avoidance strategy. Knowing you're allergic to oak and Timothy grass but not ragweed means you can treat March–June intensively and relax in August, rather than medicating all season at the same level.

For more significant allergy, the big opportunity is immunotherapy.

Immunotherapy: the only treatment that can reduce the underlying allergy

Every other allergy treatment — antihistamines, nasal steroids, decongestants, eye drops — manages symptoms. Immunotherapy is the exception: it gradually desensitizes the immune system to specific allergens, reducing or eliminating the reaction over time.

There are two delivery methods:

Allergy shots (subcutaneous immunotherapy, SCIT) involve a series of injections of increasing allergen doses, given in the allergist's office — typically weekly during a buildup phase (6–12 months) and monthly during a maintenance phase (3–5 years). You must remain in the office for 20–30 minutes after each shot to be monitored for reactions. Most people see meaningful symptom reduction within the first year of maintenance.

Sublingual immunotherapy (SLIT) uses daily dissolvable tablets or drops under the tongue, taken at home. The FDA has approved tablets for grass pollen (Grastek), ragweed (Ragwitek), and dust mites (Odactra). Sublingual therapy is more convenient than shots but covers a narrower range of allergens — you can't get a "custom mix" the way you can with shots.

Both approaches take 3–5 years for full effect, and both require commitment. The clinical evidence supports immunotherapy as genuinely modifying the underlying disease — benefits often persist for years after treatment ends, unlike medications that return symptoms the moment you stop taking them.

Immunotherapy isn't for everyone. It requires time, consistent follow-through, and isn't suitable for people with unstable asthma or certain cardiovascular conditions. An allergist can assess whether you're a good candidate.

Finding a board-certified allergist

In the US, allergists are physicians who completed medical school plus a residency in internal medicine or pediatrics plus a two-year fellowship in allergy and immunology. Board certification comes from the American Board of Allergy and Immunology.

The AAAAI's Find an Allergist tool searches by zip code for board-certified allergists in your area. You generally do not need a referral to see an allergist — you can call directly and schedule a first appointment.

For pediatric allergies, look for allergists with pediatric training or a pediatric allergist specifically — the evaluation, normal ranges, and treatment approaches differ meaningfully from adult allergy care.

Sources

• American Academy of Allergy, Asthma & Immunology. Allergy testing overview.
• American College of Allergy, Asthma & Immunology. Allergy shots (immunotherapy).
• Cox, L., et al. (2011). Allergen immunotherapy: A practice parameter third update. Journal of Allergy and Clinical Immunology.
• Calderon, M. A., et al. (2014). Subcutaneous allergen immunotherapy for allergic disease: Examining efficacy for onset and duration of action. Expert Opinion on Drug Delivery.

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