What are the other associated symptoms he is having? The causes of fever
with chills are urinary tract infection
, malaria, viral illnesses, tonsillitis, pneumonia, influenza, biliary sepsis, abscess in any organ in the body etc.He should be advised to drink plenty of fluids and take rest.Nonaspirin containing pain relievers like acetaminophen may be given at six hourly intervals. Sponging may be done with comfortably warm water.