Tonsillitis - Causes
Tonsillitis is caused by viruses or bacteria that infect the tonsils. They cause the tonsils to become inflamed and swollen. One of the first symptoms of tonsillitis is a severe sore throat (see sore throat entry). Other symptoms include fever, chills, tiredness, muscle aches, earache, swollen glands in the neck, and pain or discomfort when swallowing. Very young children with tonsillitis may become fussy and stop eating.