Fever is a symptom and cold is a disease. Fever and cold are two different concepts, so there is no way to compare which is more serious. Colds are usually upper respiratory tract infections, and common colds are usually not very serious and can be relieved after 3-5 days of appropriate treatment. There are many causes of fever, the common cold can cause fever, but there are also some more serious diseases that can cause fever, such as sepsis or malignant tumors, etc., so whether the fever is serious or not depends on the cause of the fever. If it is just a common cold or a mild to moderate infection in other parts of the body, it is usually not very serious and can be relieved with appropriate fever-reducing and anti-infective treatments. If the fever is caused by a malignant tumor or a serious systemic bloodstream infection, the primary disease will be relatively serious.