Summer is often associated with outdoor activities, vacations, and warmer weather, but for millions of people, it also means the return of seasonal allergies. Increased pollen from grasses, weeds, or other plants can trigger uncomfortable symptoms like sneezing, congestion, itchy eyes, and a runny nose. But what about swollen lymph nodes? If you’ve noticed tender lumps in your neck or under your jaw during allergy season, you may wonder whether your allergies are to ...