# Seasonal autumn allergy trends and research > Live situation record from CLSTR: https://clstr.news/situations/seasonal-autumn-allergy-trends-and-research > Updated: 2026-10-19T22:50:54.000Z. Sources: 4. Developments: 2. Autumn allergy symptoms, including sneezing, nasal congestion, and itchy eyes, are driven by seasonal triggers such as ragweed pollen and mold spores. Environmental factors like fallen leaves, moist soil, and increased rainfall create conditions conducive to mold growth, which can irritate the respiratory tract. Medical experts note that fluctuating weather conditions—specifically changes in temperature, barometric pressure, and wind—alongside agricultural activities like plowing can aggravate symptoms for those with allergies and asthma. Management strategies include the use of antihistamines, nasal sprays, HEPA air filters, and limiting outdoor exposure during windy conditions. Recent research from the Mass General Brigham Health Care System has identified a biological basis for why these sensitivities persist. Scientists discovered that nerve cells can develop a ‘memory’ of allergens, allowing the body to respond more intensely to subsequent exposures even if the allergen's molecular structure varies slightly. This finding may lead to new methods for preventing the development of sensitivities. ## Timeline ### 2026-10-19: Seasonal allergies impact millions as research reveals allergen memory As fall allergy season intensifies due to weather fluctuations, new research reveals that nerve cells can ‘remember’ allergens, potentially explaining why sensitivities worsen over time. 2 sources. https://clstr.news/cluster/seasonal-allergies-impact-millions-as-research-reveals-allergen-memory ### 2026-10-17: Autumn allergies: Causes and symptoms of seasonal triggers Autumn allergies can intensify due to ragweed pollen and increased mold spores caused by damp conditions and fallen leaves, often mimicking or complicating respiratory infections. 2 sources. https://clstr.news/cluster/autumn-allergies-causes-and-symptoms-of-seasonal-triggers --- Cite as: Seasonal autumn allergy trends and research. CLSTR, https://clstr.news/situations/seasonal-autumn-allergy-trends-and-research