When body temperature rises above 39-40°C, metabolism accelerates, and energy consumption increases. The cardiovascular and respiratory systems work faster to adapt to this condition. During this process, the body redistributes blood circulation: blood flow to the arms and legs is reduced by constricting vessels in these areas, while more blood is directed to vital organs such as the brain, heart, and liver. As a result of this physiological response, a mottled or marble-like appearance may develop on the skin; while the extremities feel cold, a high temperature persists in the torso area. While every rise in fever does not necessitate panic, it is important to be cautious and seek medical evaluation when fever exceeds 40°C.