Some of the enlarged tonsils are due to the fetus developing an emergency response to a viral infection of the mother’s body during fetal life, resulting in enlarged tonsils. After birth, it can be diagnosed as congenital enlarged tonsils. In principle, it is still caused by killing viruses and bacteria. Before puberty, children’s immune mechanism is not fully formed, and most of them rely on immune organs such as tonsils or lymph nodes to kill viruses and bacteria. Therefore, the more frequent and more attacks of cold, the more tonsils work and the stronger the irritation, slowly leading to the enlargement of tonsils. After reaching adulthood, if they are not frequently inflamed, they can be completely atrophied in the 40s, and if they flare up from time to time, the tonsils will get bigger and bigger.