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Last reviewed: May 12, 2026 Last updated: May 12, 2026

Written by: Jay Hastings , CEO of PlexusDx

Jay Hastings is the CEO of PlexusDx, a precision health company focused on genetic testing, blood biomarker insights, and personalized wellness recommendations. He has more than 20 years of experience across healthcare innovation, genomics, laboratory operations, healthcare investing, and strategic finance. His work has included scaling healthcare startups, leading CLIA lab integrations, and helping expand consumer access to precision health tools.

Medically reviewed by: Jayden Lee, PharmD, EMBA

Jayden Lee, PharmD, EMBA, is the PlexusDx Medical Science Liaison with a PharmD and MBA specializing in pharmacogenomics and clinical product development, with a proven ability to bridge the gap between genomic research and practical patient outcomes. Dr. Lee has more than 10 years of professional experience in clinical pharmacy, academia, and research.

Understanding Your Genetic Risk for Grass Pollen Allergy

Grass allergy, commonly called hay fever, happens when the immune system overreacts to grass pollen. Symptoms can include sneezing, itchy or watery eyes, runny nose, and nasal congestion. Variations near the Human Leukocyte Antigen HLA genes influence how the immune system recognizes allergens. One such variant, rs7775228, is linked to differences in how likely a person is to develop allergic responses to grass pollen. Below we explain what the different genotypes mean and provide practical, approachable ways to reduce symptoms and support immune health.

How HLA Genetics Affect Allergy Risk

The HLA genes help your body distinguish its own cells from foreign substances. Certain HLA variants can make the immune system more likely to identify pollen as a harmful invader. That can trigger production of IgE antibodies and release of histamine, producing typical allergy symptoms. The rs7775228 variant sits near the HLA-DRB4 region and is associated with altered risk for grass pollen allergy.

Genetic Interpretations

Two effect alleles (CC): Higher likelihood of grass pollen allergy

If you have the CC genotype for rs7775228, you carry two copies of the effect allele located near HLA-DRB4. This genotype is associated with HLA variants that may predispose your immune system to stronger reactions when exposed to grass pollen. You may be more likely to experience sneezing, itchy and watery eyes, runny nose, and nasal congestion during grass pollen season. This genetic predisposition reflects an underlying tendency toward heightened immune responses to grass allergens.

One effect allele (CT): Slightly increased likelihood of grass pollen allergy

If you have the CT genotype for rs7775228, you carry one copy of the effect allele. This is associated with a modestly increased risk for grass pollen allergy. The variant in the HLA region may make your immune system somewhat more likely to produce IgE antibodies and release histamine when exposed to grass pollen, potentially causing symptoms such as sneezing, itchy eyes, and nasal congestion.

No effect alleles (TT): Lower likelihood of grass pollen allergy

If you have the TT genotype for rs7775228, you carry two copies of the non-effect allele. This suggests a lower likelihood of reacting to grass pollen compared to carriers of the C variant. Your HLA variants may be less likely to trigger a heightened immune response to grass pollen, which could mean fewer or less severe allergy symptoms during pollen season.

Practical Strategies to Manage Symptoms

PlexusDx provides educational genetic information only. This is not medical advice. Always consult your healthcare provider before making changes to medications, supplements, or care plans.

Reduce Pollen Exposure

  • Check local pollen counts and limit outdoor time during peak pollen hours, typically mid morning to early evening.
  • Keep windows and doors closed on high pollen days and use air conditioning with a clean filter.
  • Shower and change clothes after being outdoors to remove pollen from skin and hair.
  • Use sunglasses and a wide-brimmed hat outside to reduce pollen contact with eyes and face.
  • Consider using high-efficiency particulate air filters to reduce indoor pollen levels.

Nasal and Symptom Relief

  • Nasal irrigation with saline can help clear pollen and mucus from nasal passages and reduce congestion.
  • Over-the-counter antihistamines and nasal steroid sprays can reduce itching and swelling. Consult your healthcare provider for recommendations and proper use.
  • A cool-mist humidifier may ease throat and nasal irritation if indoor air is dry.

Diet and Foods That Support Immune Balance

Dietary choices cannot change genes, but they can influence inflammation and immune function. Focus on whole foods rich in antioxidants and anti-inflammatory nutrients.

  • Fruits and vegetables high in vitamin C and flavonoids such as berries, citrus, kiwi, bell peppers, kale, and spinach.
  • Foods rich in omega-3 fatty acids like fatty fish, walnuts, and flaxseeds to support balanced immune responses.
  • Herbal teas such as peppermint or chamomile may soothe irritated airways and provide gentle hydration.
  • Fermented foods like yogurt, kefir, sauerkraut, and kimchi can support gut microbes that interact with the immune system.
  • Limit processed foods, excess sugar, and high-histamine foods if you notice they worsen symptoms.

Supplements That May Help

Discuss supplements with your healthcare provider to ensure they are appropriate for you and do not interact with medications.

  • Vitamin C: an antioxidant that can support immune health and may reduce symptom severity.
  • Quercetin: a plant flavonoid with stabilizing effects on mast cells, which release histamine.
  • Omega-3 fish oil: supports anti-inflammatory pathways and may help reduce allergic inflammation.
  • Probiotics: targeted strains may help modulate immune responses and support gut health.
  • Zinc: supports immune function and wound repair. Avoid high doses without medical guidance.

Lifestyle Habits for Long-Term Support

  • Maintain regular physical activity to support overall immune regulation and respiratory health.
  • Prioritize sleep to help the immune system reset and reduce the chance of exaggerated responses.
  • Manage stress with relaxation techniques such as deep breathing, meditation, or gentle yoga, since stress can amplify allergic reactions.
  • Keep indoor environments clean by vacuuming with HEPA filters and washing bedding frequently in hot water to remove pollen and dust mites.

When to See a Healthcare Provider

If allergies significantly interfere with daily life, sleep, or work, or if over-the-counter measures are not effective, speak with your healthcare provider. They may recommend allergy testing, prescription medications, or immunotherapy options that target immune responses to pollen.

Final Notes and Disclaimer

PlexusDx provides educational information to help you understand how genetic variation may influence your likelihood of developing a grass pollen allergy. This information is not a diagnosis and does not replace professional medical care. Always consult your healthcare provider before starting or stopping medications, supplements, or other treatments. Your healthcare provider can interpret genetic information alongside your medical history, symptoms, and other test results to develop a tailored plan for your health and wellness.

If this genetic variant is present in your PlexusDx results, the following tests and reports are commonly used to explore it further:

🧬 Genetic Tests:

🧪 Blood Tests:

📄 Genetic Report:

Frequently Asked Questions About Grass Allergy and HLA rs7775228

What does the grass pollen allergy rs7775228 HLA variant mean?

The rs7775228 variant is located near the HLA-DRB4 region, where HLA genes help your immune system recognize what is “self” versus “foreign.” This variant is associated with differences in risk for grass pollen allergy by influencing how likely your immune system may trigger IgE antibody production and histamine release—leading to common hay fever symptoms during grass pollen season.

How do the rs7775228 genotypes (CC, CT, TT) relate to my hay fever risk?

If you have the CC genotype, you have two effect alleles and a higher likelihood of grass pollen allergy, which may correspond to stronger reactions when exposed to grass pollen. If you have the CT genotype, you have one effect allele and a slightly increased risk. If you have the TT genotype, you have two non-effect alleles and a lower likelihood of reacting to grass pollen compared with C-allele carriers.

What practical steps can help reduce grass pollen allergy symptoms regardless of genotype?

You can reduce symptom flare-ups by limiting pollen exposure (monitor pollen counts, keep windows closed on high days, shower and change clothes after being outdoors, and use HEPA filtration). For relief, consider saline nasal irrigation and discuss appropriate options like OTC antihistamines or nasal steroid sprays with your healthcare provider. Supporting immune balance with anti-inflammatory foods (vitamin C and flavonoid-rich fruits/vegetables, omega-3 sources, fermented foods) and targeted supplements (like vitamin C, quercetin, omega-3s, probiotics, or zinc) may also help—though you should consult a clinician first, especially before starting supplements or changing medications.

What tests can help me learn more about Grass Allergy and HLA rs7775228?

The Food Sensitivity & Allergy Genetic Test analyzes over 240 genetic insights related to immune response, inflammation, and dietary tolerance. The Allergies and Food Sensitivities Genetic Report translates your results into personalized, actionable guidance. Your healthcare provider can also recommend targeted blood tests based on your specific pathway results and health history to complement your genetic insights with current biomarker data.

Medical and Editorial Standards

Medical review process: This article was reviewed for medical accuracy, scientific clarity, evidence alignment, and appropriate discussion of genetics, medications, supplements, biomarkers, and health-related claims.

Sources and evidence: PlexusDx educational content is developed using peer-reviewed research, clinical literature, reputable medical references, and, where applicable, public health or regulatory guidance. References are included at the end of the article when scientific, medical, or health-related claims are discussed.

Commercial transparency: PlexusDx offers genetic testing, blood biomarker testing, personalized supplement recommendations, and related precision wellness services. Product mentions are intended to help readers understand available options and should not be interpreted as medical advice.

Important disclaimer: PlexusDx educational content is for informational purposes only and should not be used as a substitute for professional medical advice, diagnosis, or treatment. Always consult a qualified healthcare provider before making decisions about medications, supplements, genetic testing, lab testing, or health-related care.