Both the tonsils and adenoids help trap bacteria or viruses (pathogens) that enter your mouth or nose. They are part of the immune system and produce antibodies that kill these pathogens before they can reach the rest of the body. The tonsils are located at the back of the throat, that are two round lumps of tissue, you can see when you open your mouth wide. Adenoids are in the upper part of your nasal cavity. Tonsils and adenoids can become enlarged, often caused by step throat, mononucleosis, or the flu.
If you have recurring tonsillitis, difficulties breathing through your nose or loud breathing you should go see the doctor.