Tonsils and adenoids are masses of tissue that are similar to the lymph nodes or “glands” found in the neck, groin, and armpits. Tonsils are the two masses on the back of the throat. Adenoids are high in the throat behind the nose and the roof of the mouth (soft palate) and are not visible through the mouth without special instruments.
Tonsils and adenoids are near the entrance to the breathing passages where they can catch incoming germs, which cause infections. They “sample” bacteria and viruses and can become infected themselves. Scientists believe they work as part of the body’s immune system by filtering germs that attempt to invade the body, and that they help to develop antibodies to germs.