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During challenging physical conditions and situations, the body undergoes temperature changes. For instance, the body shows signs and symptoms that trigger the natural body defenses against dreaded diseases. Chills often predict the coming of a fever or an increase in body temperature. The body tries to generate heat when it feels cold through rapid contraction and relaxation that can cause chills. When fever manifests, the body's temperatures reaches one or two notches higher than 98.6 degrees Fahrenheit and may indicate an infection or illness.