Decatur, Georgia. For the southwestern Georgia county, see Decatur County, Georgia. Decatur is a city in, and county seat of, DeKalb County, Georgia, United States. With a population of 20,148 in the 2013 census, the city is sometimes assumed to be larger since multiple zip codes in unincorporated DeKalb County bear the Decatur name.
Chills are caused by rapid muscle contraction and relaxation. They are the body's way of producing heat when it feels cold. Chills often predict the coming of a fever or an increase in the body's core temperature. Chills are an important symptom with certain diseases such as malaria.
Spending time in cold or hot climates can cause hot and cold flashes as the body tries to stabilize its internal temperature, according to the NLM. Jupiterimages/Brand X Pictures/Getty Images. HIV. HIV is a sexually transmitted disease that may also cause these flashes, according to the Mayo Clinic.