The causes of this symptom can include unlikely diseases and medications. Furthermore, the causes may vary based on age and gender of the affected person, as well as on the specific characteristics of the symptom such as quality, time course, aggravating factors, relieving factors, and associated complaints. Use the Symptom Analysis option to explore the possible explanations for chills, occurring alone or in combination with other problems. Chills may occur at the beginning of an infection and are usually associated with a fever . Chills are caused by rapid muscular contraction and relaxation and are the body's way of generating heat when it perceives that it is cold.
Chills often herald the onset of a fever or increase in the degree of fever.
Chills may also represent a very significant and consistent finding in certain diseases such as the chills seen in malaria . Children tend, in general, to develop higher fevers than adults. Even minor illness may produce high fevers in younger children. Infants tend not to develop obvious chills but any fever in an infant of 6 months or less should be reported to a health care provider. Fevers in infants 6 months to 1 year should be reported unless the parent is absolutely sure of its cause.