It is normal not to have a fever for many years. Under normal circumstances, with the help of the regulation of the body temperature center, the body maintains heat dissipation and heat production in a dynamic balance. There are no special reasons that usually cause fever. Fever is commonly caused by infectious diseases such as bacterial and viral infections. These disease-causing microorganisms cause central nervous system dysfunction and imbalance of heat dissipation and heat production, which leads to the appearance of fever. Many years without fever suggests that the body has a relatively strong resistance and is not or rarely infected by pathogens. Try to relax your mind and regulate your personal eating habits during weekdays. At the same time, appropriate physical exercise to strengthen the body, you can prevent the attack of foreign pathogenic bacteria. However, the absence of fever does not necessarily mean that the body is healthy and disease-free, so if there are other symptoms of physical discomfort, you should go to the hospital in a timely manner for a formal medical examination.