When you have a fever, you can eat foods that can reduce fever, such as the simplest is to drink more hot water, or you can boil ginger sugar water with shredded ginger and brown sugar, which can induce sweating and help reduce fever. You can also boil water with shredded white onion, which also makes you sweat and brings down your body temperature, and you can drink more hot noodles, congee or soup. If it is in summer, you can drink more mung bean soup, which has the effect of clearing heat and detoxifying and removing fire. You can also squeeze fresh juice, such as watermelon juice, orange juice can clear the heat and detoxify the body, diuretic, and play a role in reducing fever. In addition, during the fever and cold, you should eat more fresh vegetables and fruits. Because green vegetables and fruits are rich in vitamin C, which has a certain inhibitory effect on cold and flu viruses, it can also promote fever reduction and relieve symptoms.