Cold viruses are afraid of high temperatures, so when you have a cold, your brain will issue instructions to cause the body to have a fever.

When a cold virus invades the body, we will initially have a runny nose and sneeze to expel the virus from the body.

The white blood cells then begin to fight the viruses and eat them. When the brain learns that a virus has invaded, it will issue instructions to increase the body's temperature, with the purpose of making cold viruses that are intolerant to high temperatures weaker.

Extended information

Cold and fever refer to the fever symptoms often caused by colds. The occurrence of colds is mainly due to physical weakness and weakened disease resistance. When the climate changes drastically, because the internal and external functions of the human body cannot adapt, evil spirits take advantage of the deficiency and enter through the fur, mouth and nose, causing a series of fever symptoms.

Fever refers to a situation in which a pyrogen acts directly on the body temperature regulation center, resulting in excessive heat production and reduced heat dissipation caused by dysfunction of the body temperature center or various reasons, causing the body temperature to rise beyond the normal range.

Colds and fevers are both beneficial and harmful to the human body. When you have a fever, your immune function is significantly enhanced, which is helpful in eliminating pathogens and promoting recovery from the disease. Therefore, there is no need to use antipyretics when the body temperature is not too high. You only need to pay close attention to changes in body temperature. When the temperature exceeds 38.5 degrees, you should take antipyretics in time.

Reference source: Baidu Encyclopedia-Cold and Fever