The adenoids are lymph nodes located in the back of the throat behind the nose. Lymph nodes make up part of the lymphatic system, which helps the immune system to fight infection. Other lymph nodes are located in many places, including the neck, armpits, chest, abdomen and groin.

Are tonsils and adenoids lymph nodes?

Tonsils and adenoids are similar to the lymph nodes or “glands” found in the neck, groin, and armpits. Tonsils are the two round lumps in the back of the throat.

What causes the adenoids to swell?

Because adenoids trap germs that enter the body, adenoid tissue sometimes temporarily swells (becomes enlarged) as it tries to fight an infection. Allergies also can make them get bigger. The swelling sometimes gets better. But sometimes, adenoids can get infected (this is called adenoiditis).