The tonsils are two small masses of tissue at the back of the throat. They are part of the body's immune system. This system helps the body fight disease. Usually, tonsils shrink with age. But in some people, this does not happen and their tonsils become infected or enlarged. This can cause severe sore throats, snoring, sleep disorders, and other problems. Tonsillectomy is surgery to take out the tonsils. Tonsillectomy may be advised if you have obstruction causing sleep apnea. Sleep apnea can happen if something blocks the upper airway during sleep. Sleep apnea can cause fatigue, restlessness, and even high blood pressure. Or you may need surgery if you have recurring, chronic, or severe infections.