Pollen, dust, pet dander, mold spores, bacteria, and many pollutants are so small that they float through the air. When people breathe in, touch, or consume these particles, the body recognizes them as foreign invaders and releases histamines. This natural chemical is produced in white blood cells and released into the body triggering allergic reactions such as sneezing, itchy eyes and runny nose. Sometimes, people have a dangerous reaction called anaphylaxis, which can involve swelling of the airways. If you have ... read more