Can allergies cause your lymph nodes to swell?

Not usually: Environmental and food allergies do not cause lymph node swelling. Generally lymph node swelling is associated with infections and less commonly with some cancers. However, there are some uncommon medication allergies that have lymph nodes swelling; one is called dress (drug reaction with eosinophilia and systemic symptoms).

Monitoring Centers: Lymphatic system absorbs/carries things too big to go into the arteries/veins like bacteria eaten by white cells/digested food. Lymph nodes "taste" the lymph everywhere for bad stuff like bacteria/viruses/cancers, etc. When it detects a problem, it alerts the immune system and your body reacts. They enlarge in response to the inflammation they create when they react. They shrink when all is well.

Not usually but...: Lymphatic system absorbs/carries things too big to go into the arteries/veins like bacteria eaten by white cells and digested food. Lymph nodes "taste" the lymph for anything bad like bacteria/viruses/cancers, etc. When it detects a problem, it alerts the immune system and your body reacts. They enlarge in response to the inflammation they create when they react. They shrink when all is well.

Drug allergy can: Typical allergies to pollen, pet, mold, dust, food, bees, latex, etc do not cause swollen lymph nodes. There are drug allergic reactions including serum sickness and dress syndrome that can have enlarged lymph nodes.