What Causes Fall Allergies?
Male plants release tiny cells called pollen into the air in order to reproduce. When these pollen or other allergy triggers get into the noses of certain people, their immune system mistakenly sees them as foreign invaders and releases antibodies — substances that normally identify and go after bacteria, viruses, and other illness-causing organisms. The antibodies attack the allergens, which leads to the release of chemicals called histamines into the blood. Histamines trigger the runny nose, itchy eyes, and other symptoms of allergies. During the fall season, ragweed is the biggest allergy trigger. Though the yellow-flowering weed typically begins pollinating in August, it can linger well into the fall months. About three-quarters of people who are allergic to spring pollen-producing plants are also allergic to ragweed. Ragweed pollen can travel for hundreds of miles on the wind, so even if it doesn’t grow where you live, it can still make you miserable if you’re allergic to it. Mol
