Sharpness or coldness. The feeling of coldness or chillness means shudder of a slight cold. It can occur as the reason for fever or just because of the cold air around you. Still, speaking about malaria, this illness can be a factor of mitigating. Any kind of body chilling condition because of the infections or even cancer may provoke fever and shaking or feeling cold. Such shaking is also a widespread symptom of influenza. Looking at the chills from a different angle, it means spontaneous muscles squeeze and relaxation.
Aching head. Almost all diseases have a headache in the list of common signs. Mainly it comes along just as a headache, and that is it. In the most cases, an aching head may be the result of being extremely active or because of the problems with nervous system, muscles, or vessels. However, if the reason is the infection, it requires a special attention. In the malaria example, when a person is infected, the headache can be the consequence of the virus itself, or it can be caused by the other malaria symptoms.
Coldness. In medical language, actually, or in the language of infection diseases, coldness and fever are “brothers” of any infection. Physically, fever is a temperature rise of a human body or a body of any other creature. Normally, the temperature of the human mouth is about 98.6 Fahrenheit or 37 Celsius degrees. Coldness is the well-known symptom of even not serious infections and flue. Still, it is quite anxious when the temperature rises to 100.4 F or 38 C degrees. This kind of fever must be treated medically. Therefore, the answer to the question “Why fever is always an immediate symptom?” is obvious.