Body aches
Chills
Elevated body temperature
Fatigue (tiredness)
Flushed complexion
General weakness
Headaches
Irritability
Loss of appetite
Shaking
Shivering
A bacterial infection
A malignant tumor
A viral infection
Acellular pertussis (DTaP)
Alcohol withdrawal
Amphetamine abuse
Heat exhaustion
Pneumococcal vaccine
Some medications including high blood pressure or seizures medicines
Teething (in infants)
General Physician