The most effective approach to allergies combines the right medication with practical changes to your environment. For seasonal or year-round nasal allergies, a steroid nasal spray is the single most effective over-the-counter option, outperforming oral antihistamines for both nasal and eye symptoms. But medication is only one piece of the puzzle, and the best strategy depends on what you’re allergic to and how severe your symptoms are.
Why Allergies Happen
An allergic reaction starts when your immune system misidentifies a harmless substance (pollen, pet dander, dust mite protein) as a threat. Your body produces antibodies that latch onto specialized immune cells in your tissues and bloodstream. The next time you encounter that allergen, those antibodies trigger the immune cells to dump histamine and other inflammatory chemicals into surrounding tissue. Histamine is what causes the itching, sneezing, congestion, and watery eyes you recognize as allergy symptoms. It makes blood vessels leaky, airways tighten, and mucous membranes swell.
This is why most allergy treatments work by either blocking histamine, calming the broader inflammatory response, or reducing your exposure to triggers in the first place.
Nasal Sprays vs. Oral Antihistamines
If you’ve been relying on oral antihistamines alone, you may be leaving relief on the table. A systematic review with meta-analysis found that intranasal treatments are superior to oral medications at improving both nasal and eye symptoms, along with overall quality of life. Nasal sprays also tend to work faster.
The updated 2024-2025 ARIA guidelines (the international standard for treating allergic rhinitis) lay out a clear hierarchy:
- Best overall option: A combination nasal spray containing both an antihistamine and a steroid. This is the top recommendation for people whose symptoms don’t respond well to a single medication.
- Strong second choice: A steroid nasal spray on its own, which the guidelines rank above a nasal antihistamine alone.
- Oral antihistamines: Still useful, especially for mild symptoms or when you need fast, short-term relief from itching and sneezing. Non-drowsy versions are widely available.
One important note on decongestant nasal sprays: the guidelines recommend against using them for longer than five days. They provide quick congestion relief but can cause rebound swelling that makes things worse.
Saline Rinses: Simple and Effective
Rinsing your nasal passages with salt water is one of the cheapest, lowest-risk things you can do. It physically flushes out allergens, mucus, and inflammatory debris. A meta-analysis of six studies found that saline irrigation significantly improved symptom scores compared to no treatment, with benefits lasting up to eight weeks. You can use a squeeze bottle or neti pot with a commercially available saline packet. Some people use as little as 5 mL per nostril, though larger volumes (60 mL or more) provide a more thorough rinse. Always use distilled, sterile, or previously boiled water.
Controlling Allergens at Home
Reducing your exposure to allergens can be just as important as medication, especially for indoor triggers like dust mites, mold, and pet dander.
Air Filtration
A true HEPA filter removes at least 99.97% of airborne particles at 0.3 microns, which is the hardest particle size to capture. Pollen, mold spores, dust mite debris, and pet dander are all larger than this, so they’re trapped with even higher efficiency. A portable HEPA unit in your bedroom, where you spend roughly a third of your day, gives the biggest return.
Bedding and Dust Mites
Dust mites thrive in mattresses, pillows, and bedding. Washing sheets and pillowcases in water at 55°C (130°F) or hotter kills all mites. Lower temperatures, even with detergent, don’t reliably kill them. Allergen-proof encasements on your mattress and pillows add another layer of protection by trapping mite allergens inside.
Pet Allergens
Cat allergies are driven primarily by a protein called Fel d 1, which cats produce in their saliva and spread across their fur during grooming. Interestingly, a specialized cat food containing egg-based antibodies against Fel d 1 has been shown to reduce the allergen on cat hair by an average of 47% after 10 weeks, with 86% of cats in the study showing a reduction of 30% or more. People exposed to hair from cats fed this diet reported less nasal congestion and fewer eye symptoms. This won’t eliminate your allergy, but it’s a meaningful reduction if you’re committed to keeping your cat. HEPA filters and keeping pets out of the bedroom remain practical staples.
Immunotherapy for Long-Term Relief
If your allergies are severe or year-round, immunotherapy is the only treatment that can change how your immune system responds to allergens rather than just managing symptoms. It works by exposing you to gradually increasing amounts of your trigger allergen until your body learns to tolerate it. There are two forms:
- Allergy shots (subcutaneous immunotherapy): Injections given at a doctor’s office, typically weekly during a buildup phase, then monthly for maintenance. Treatment generally spans three to five years.
- Allergy tablets (sublingual immunotherapy): Dissolving tablets taken daily under the tongue at home, available for grass pollen, ragweed, and dust mites. Also used over a multi-year course.
Both approaches produce comparable results. A systematic review comparing the two in children with allergic rhinitis found no significant difference in symptom scores or medication use between shots and tablets. The choice often comes down to convenience (tablets at home vs. regular office visits) and which allergens you need treated, since sublingual tablets are only available for a limited set of triggers.
Food Allergy Management
Food allergies follow the same immune pathway as airborne allergies but can cause more severe reactions, including anaphylaxis. Strict avoidance of the trigger food remains the foundation of management. For peanut, egg, and milk allergies, oral immunotherapy (consuming tiny, carefully controlled amounts of the allergen under medical supervision) has been shown to desensitize roughly 60 to 80% of patients studied, according to the American Academy of Allergy, Asthma & Immunology. This doesn’t cure the allergy but raises the threshold at which a reaction occurs, offering a safety buffer against accidental exposure.
What About Supplements?
Quercetin, a plant compound found in onions, apples, and berries, is frequently marketed as a natural allergy remedy. In lab studies, it stabilizes the immune cells that release histamine and dials down inflammatory signaling. The problem is translating that to real life. Only two clinical trials have tested quercetin on its own for allergies in humans, and while both showed promising symptom reduction, the body absorbs only 3 to 17% of a typical oral dose. Some formulations use fat-based delivery systems to improve absorption, but large, rigorous trials are still missing. Quercetin is unlikely to replace proven treatments, though some people find it a helpful add-on.
Putting It All Together
For most people with seasonal or indoor allergies, the practical playbook looks like this: start with a steroid nasal spray (or a combination spray if symptoms are moderate to severe), add saline rinses as a daily habit, and tackle your biggest environmental triggers with HEPA filtration, hot-water laundering, and allergen-proof bedding. Oral antihistamines remain useful for breakthrough symptoms or days when pollen counts spike. If you’ve tried all of this and still struggle, immunotherapy offers the possibility of retraining your immune system over several years, with lasting benefits that persist after treatment ends.