Fever is a common clinical symptom, and many people have cold hands and feet when they have a fever. In terms of Chinese medicine, this condition may be a symptom of table heat and cold inside, or some manifestation of Yang Qi that will be taken off. Cold feet when you have a fever is mainly because when you have a fever, the blood vessels at the end of the extremities contract, resulting in poor local blood circulation, which produces a feeling of low temperature and coldness. This is a situation of false cold and real heat, although the feet are cold, but the body is still in a state of fever. If the condition improves and the body temperature gradually drops, the blood vessels at the end of the extremities will gradually stretch and the blood circulation in the hands and feet will gradually become warmer when the circulation is improved. Secondly, for children, because the central nervous system is not yet well developed, thermoregulation ability is not perfect, if the ambient temperature is low, the feet are exposed outside for a long time, there will be fever on the body and cold feet. Be sure to drink more water during the fever to promote metabolism. You can also soak your feet in warm water to promote blood circulation and help cool down to relieve discomfort. Do not wear tight clothes, as tight clothes can hinder blood circulation. Usually, you should do proper physical exercise to strengthen your body and increase the immunity of your body. In short, cold feet when you have a fever is mostly a normal condition, so there is no need to worry too much. First of all, some physical cooling methods should be used to lower the body temperature and relieve the symptoms. Secondly, you can go to the hospital for blood tests to identify the cause of the disease and treat the cause.