What are the symptoms of swollen tonsils, which are often caused by bacterial infections that lead to tonsillitis, resulting in swollen and enlarged tonsils? There will be sore throat, fever, and in severe cases, there may be difficulty in breathing. When tonsillitis spreads to the surrounding tissues, it can easily lead to peri-tonsillitis, peri-tonsillar abscess, and furthermore, it can lead to lateral pharyngeal abscess and posterior pharyngeal space infection. In addition, tonsillitis and tonsillar enlargement can also lead to rheumatic fever, myocarditis, deep neck infection, etc. If the enlargement of tonsils is serious, it can affect the function of the heart and cause myocarditis, which can be more dangerous. In addition, if the enlargement of tonsils is painless and persistent, tumors may be suspected, so it is important to go to the hospital promptly.