The phenomenon of low fever at night and no fever during the day is in many cases due to the fact that people are more active during the day and even if they have a slight fever, it is less likely to be noticed. The body’s metabolic rate is faster during the day, the body’s functions are more active, and the resistance is stronger, so it is less likely to have a fever at this time, but at night the body’s functions are more likely to be rested, the body’s metabolic rate is slower, and the functions are less active, so the resistance is relatively weaker, making it easier to have a fever. The human body temperature at night is slightly higher than during the day, so once a mild fever, that is, a low fever, is more easily detected at night, so there is a low fever at night and no fever during the day. This time you need to find out the cause of the fever for targeted treatment, in most cases the fever is caused by an infection, such as viral or bacterial, you need to choose the right antibiotics or antiviral drugs for treatment according to the type of infection.