Discover how allergies can cause swollen lymph nodes, and learn to distinguish between normal immune responses and warning ...

Medically reviewed by Daniel More, MD Allergies occur when your immune system overreacts to allergens like pet dander, pollen ...

Sometimes, a person may have an immune disorder that causes lymph nodes to swell. Less common causes of swollen lymph nodes include: metastatic cancer, which is cancer that has spread from its ...