If you’ve suddenly started sneezing nonstop or dealing with a stuffy nose seemingly out of nowhere, seasonal allergies may be the reason. Allergy symptoms can appear quickly, especially during times of the year when pollen, grass, or mold levels are high. Because allergies often mimic symptoms of a cold or sinus infection, many people aren’t sure what’s actually causing their congestion. Understanding the signs of seasonal allergies can help you identify triggers ...