Simplify the following text for a Grade 7 native English-speaking person.
Original: An inflammation of the tonsils is called tonsillitis , which causes one 's tonsils to become sore and swollen .
Simplified: An infection of the tonsils is called tonsillitis or Tonsilitis . Most commonly , the term `` tonsils '' refers to the palatine tonsils that can be seen in the back of the throat .