Frequent urination when you have a fever is most often caused by a fever itself due to a urinary tract infection. The main manifestation of urinary tract infection is the frequency, urgency, heat and pain of urination, so if you have a fever and at the same time find that urination is particularly unpleasant and you always want to go, and you always feel uncomfortable in your urethra after a trip, most of these cases are urinary tract infections. In addition, if it is a common cold and fever when there is frequent urination, and there is no urinary tract infection, because many of the drugs for fever are through the diuretic, through the urine to discharge the toxins of fever inflammation, itself this is a discharge channel, fever is more likely to dehydration, once dehydrated, no urine instead will trigger the poisoning of the kidneys. So it is not a bad thing that you should drink more water when you have a fever and keep your urine flowing so that it can expel more toxins.