First, it should be correctly understood that a fever is a type of immune response of the body. When the body is infected by bacteria, viruses, chlamydia, mycoplasma, etc., it leads to this kind of immune response, causing fever symptoms. During a fever, the body's blood concentrates in the brain tissues, and other important organs such as the liver, heart, and gastrointestinal tract. Comparatively, the blood supply to the hands, feet, and limbs decreases, which is a protective response. A cold is caused by a viral infection, and inflammation stimulates the body's temperature regulation center, causing a protective reaction. Therefore, there is no need to worry; symptomatic treatment is enough.