Tonsillitis is best characterized by the symptoms of fever. Doctors say that a body temperature of more than 100.4 F describes the condition of fever, which may point to many other related illnesses. The infection has penetrated the body in any case, so it is better to consult a healthcare professional to understand the real cause. On the whole, those who are diagnosed with tonsillitis may experience various throat-based symptoms known to the doctors. Other similar signs include chills.